Review topics Natural hazards such as earthquakes, floods, weather-related consequences and possible overlaps

Transcription

1 RSK catalgue f requirements, as at Nte: This is a translatin f the dcument entitled Anfrderungskatalg für anlagenbezgene Überprüfungen deutscher Kernkraftwerke unter Berücksichtigung der Ereignisse in Fukushima-I (Japan). In case f discrepancies between the English translatin and the German riginal, the riginal shall prevail. Catalgue f requirements fr plant-specific reviews f German nuclear pwer plants in the light f the events in Fukushima-I (Japan) The fllwing catalgue f requirements, listed in keywrds, fr the reviews may be supplemented, in particular in case f changed knwledge abut the event sequences and causes in Fukushima-I. The catalgue f requirements refers t the entire reactr cmplex, including the fuel pls, and cvers all perating cnditins. The catalgue f requirements includes a partial verlap by the fact that pstulated superimpsitins are addressed frm tw sides (e.g. necessary accident management measures in cases f extreme fld impact f flds n emergency measures); fr the implementatin f the reviews, attentin is therefre t be paid t apprpriate c-rdinatin. When preparing the catalgue f requirements, it has been taken int accunt, as required accrding t Criterin 1.1 f the Federal Ministry f the Interir (BMI), that measures and installatins have t be available t avid incidents and failures ( first and verriding principle ), and t cntrl accidents ( secnd principle ). With regard t the defence-in-depth cncept applicable in the field f nuclear technlgy it wuld nt be effective t limit the cnsideratins nly t accident management measures that may have t be supplemented. Review tpics Natural hazards such as earthquakes, flds, weather-related cnsequences and pssible verlaps Tpic earthquakes - Review f the bundary cnditins fr the site-specific determinatin f the design earthquake - Review f the design n the basis f the design earthquake, stating the reserves - Review with regard t the maintenance f vital functins in case f increased earthquake impact RSK/ESK Secretariat at the RSK434 \ RSK-Anfrderungskatalg 434 th RSK Federal Office f Radiatin Prtectin / dib/waf Page 1 f 5

2 RSK catalgue f requirements, as at Review f secndary damages with regard t the event sequence, including aftershcks: e.g. rise r fall f river level, fire, lss f clant, flding, destructin f infrastructure, impairment f staff availability, dynamic lads due t building failure, H 2 explsin (e.g. generatr) Tpic flds - Review f the bundary cnditins fr the site-specific determinatin f the design fld - Review f the design and precautinary measures n the basis f the design fld, stating the reserves - Review with regard t the maintenance f vital functins in case f a beynd design basis fld, e.g. by failure f dams/barrages r majr fld prtectin measures, lng-lasting fld, extreme strm surge, tsunami, effects f fltsam, taking int accunt the destructin f infrastructure and impairment f staff availability - Review f the impacts n accident management measures in case f beynd design basis water level (maybe after shrt advance warning time) Tpic ther natural hazards (including climatic influences) : Review f the maintenance f vital functins in case f strm, trnad, wind lads, snw lads, high and lw temperatures, drught, heavy rain, lightning, landslides, etc., and their superpsitin, as far as beynd the design basis Man-made hazards Tpic aircraft crash Review f the maintenance f vital functins in case f cmmercial aircraft r military aircraft crash (accidental, deliberate) under cnsideratin f the fllwing: - Crash scenaris (aircraft type, speed, lading, impact lcatin, etc.) - Structural reserves in case f lads caused by aircraft impact - Mechanical impacts including impact f wreckage - Fuel fire effects - Effectiveness f spatial separatin - Leak as cnsequential event (induced vibratins) - Pssibility and effectiveness f accident management measures under cnsideratin f impacts n infrastructure and persnnel RSK/ESK Secretariat at the RSK434 \ RSK-Anfrderungskatalg 434 th RSK Federal Office f Radiatin Prtectin / dib/waf Page 2 f 5

3 RSK catalgue f requirements, as at Tpic gas release Review f the bundary cnditins fr the determinatin f the site-specific impacts caused by txic and explsive gases and blast wave Tpic impact f an accident in a pwer plant unit n the neighburing unit Review f the impact f a beynd design basis event in a pwer plant unit n the neighburing unit Tpic terrrist attacks Review f the maintenance f the vital functins r accident management measures in case f - Lss f individual infrastructures r buildings (parts theref) - Selective lcal destructin f systems Tpic external attacks n cmputer-based cntrls and systems Review f the maintenance f the vital functins in case f external attacks n cmputer-based cntrls and systems Extended pstulates independent f specific event sequences Tpic statin blackut (SBO) Review f the maintenance f the vital functins in case f statin blackut fr mre than tw hurs with regard t - Plant behaviur - Battery capacity - Prvisin and effectiveness f accident management measures Tpic lng-lasting lss f ffsite pwer Review f the maintenance f the vital functins in case f a lng-lasting lss f ffsite pwer fr mre than 72 hurs with regard t - Diesel supply (fuel, il, cling water) RSK/ESK Secretariat at the RSK434 \ RSK-Anfrderungskatalg 434 th RSK Federal Office f Radiatin Prtectin / dib/waf Page 3 f 5

4 RSK catalgue f requirements, as at Repair r replacement f diesel engines by alternative emergency pwer supply (gas turbine, hydrelectric pwer plant) - Replacing diesel by diverse netwrk cnnectin Tpic lss f service water supply Review f the maintenance f the vital functins in case f lss f the redundant service water supply with regard t - Diversified cling facilities (e.g. well cling) - Optins fr accident management measures (technical/administrative) Rbustness f precautinary measures Tpic effectiveness f special preventive measures Review f the rbustness f the precautinary measures e.g. with regard t the fllwing: - Assessment f plant-specifically realised redundancy separatin and structural prtectin measures - Crss-redundancy impact f internal hazards, such as fire, flding in the reactr building, inadvertent pening f valves - Ensuring the supply f cling water in case f natural impacts, such as jellyfish, shells, fltsam and man-made hazards (e.g. ship accidents) Unfavurable bundary cnditins fr the implementatin f accident management measures Tpic accident management measures Review f accident management measures with regard t their cmpleteness and effectiveness in case f lss f fuel cling pssibilities - befre ccurrence f fuel damage in the reactr pressure vessel in the fuel pl - after ccurrence f fuel damage in the reactr pressure vessel in the fuel pl - after cntainment failure - after failure f the reactr pressure vessel cre melt in the reactr cavity (PWR) RSK/ESK Secretariat at the RSK434 \ RSK-Anfrderungskatalg 434 th RSK Federal Office f Radiatin Prtectin / dib/waf Page 4 f 5

5 RSK catalgue f requirements, as at cre melt in the cntrl rd drive chamber r lining chamber (BWR) - fuel element melt in the fuel pl Fr the review f the abve three issues, statements are t be made, in particular, - n the suitability and availability f the required instrumentatin, - n pssible H 2 reactins (radilysis + zircn reactins + melt/cncrete interactin) - n ptential H 2 accumulatins in the cntainment and surrunding buildings, - n the preventin f, e.g., H 2 deflagratin r H 2 detnatin (inertisatin, recmbiner cncept), als taking int accunt venting prcesses, and - n the preventin f recriticality. The descriptin f the accident management measures r prcedures prvided has t include the fllwing aspects: - Organisatin - Use f existing facilities - Prvisin f mbile devices - Supplies - Cmmunicatin and infrmatin systems (internal, external) - Feasibility f accident management measures taking int accunt the fllwing: Extensive destructin f infrastructure including the cmmunicatin facilities (making technical and persnnel supprt frm utside mre difficult) Feasibility and effectiveness f accident management measures under the bundary cnditins f external hazards (earthquakes, flds, aircraft crash) Activity release at the site Inaccessibility and impairment f wrk perfrmance due t high lcal dse rates r debris frmatin Unavailability f pwer supply Ptential failure f instrumentatin Failure f instrumentatin Evacuatin f the plant with staffing f the emergency cntrl rm and anther rm (ensuring cmmunicatins, task planning and c-rdinatin, incident measurement prgramme) RSK/ESK Secretariat at the RSK434 \ RSK-Anfrderungskatalg 434 th RSK Federal Office f Radiatin Prtectin / dib/waf Page 5 f 5