ML20002B693
| ML20002B693 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/01/1980 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20002B695 | List: |
| References | |
| NUDOCS 8012220491 | |
| Download: ML20002B693 (2) | |
Text
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SUEJECT:
C'.R SCRAll SYSTEM o
E to TIpoolito PKreut::er On June 23, 1980, during a rcutine shutdcwn of the 3rewns Ferry 3 reacter, a manual scram f ailed to insert all centrol reds.
I!E Sulletin 80-17 uith subsequent supplements 1, 2 and 3 has been issutJ whicn has required system modifications, precedural and design verificaticr.s, additicnal surveillance and tests, and analyses to assure adequate short-term performance of existing scram systems en operating plants.
However, we believe further hardware and prccccural changes will be required to assure adequate icng-term scram system reliability. We are aware that the Sk2 cwners have formed a Sub-Group of the BWR Cuners Grcup to address this matter and are in tne process of develcping design and perfcrmance criteria.
Therefore, in order to determine wnether or not ycur license shculd be modified, please provide us in writing, under oath cr affirmation, within 25 days cf the date of this letter your plans for participation in this effort.
In acotticn, ycur respense should include:
(1) The results of any reassessment of your present scram system to confirm confernance with the General Design Criteria (Appendix A to 10 CFR 50).
(2) Whether you intend to reevaluate your present scra:a system and modify it as necessary to met the additional design and perfor-mance criteria developed by the Owners Sub-Group.
If not, what criteria will be used to judge the adequacy of your present scram system?
(3) Whether you intend to provide by December 15, 1980, the results of the above reevaluation (including required modifications) along with a schedule for inplementation.
If net, why not.
This information is requested under the authority of 10 CFR 50.54(f) of the Cccraission's regulations.
If ycu have any questions concerning this matter, please call your Project
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g Sincerely,
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Darrell G. Eisenhut, Director i
Division of Licensing OFFICE suaNaC4.. Service Lists.
. CONCURRENCES k!!$ PREVIOUS hAGE-cat E >j.
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i, NAc FORM 318 (9 76) NRCV 0240 C'U.S. GOVERNMENT PRINTING OFFICE: 1979 289 369
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Gray Files DEisenhut HSmith TNovak CParrish TO ALL Ek2 LICENSEES SUMB RIngram GLainas EHylton S&'ECT: BWR SCRM SYSTEM RTedesco PKreutzer TIppolito.
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On June 28, 1980, during a routine shutdcwn of the Brcuns Ferry 3 reacter, a manual scram f ailed to insert all control rods.
ISE Sulletin 50-17 with subsequent supplements 1, 2 and 3 has been issued which has required system modifications, ::recedural and design verifications, additional surveillance and tests, and analyses to assure adequate shcrt-term performance of existing scram systems en operating plants.
However, we believe further hardware and procedural changes will be required to assure adequate long-term scra:n system reliability. We are aware that the SLR owners have formed a Sub-Grcup of the SWR Owners Group to address this matter and are in the process of developing des 1Sn and perferrance criteria.
Within 20 days of the date of receipt of this letter, pursuant to 10 CFR 50.54(f), provice us with ycur plans for participation in this effort. In additien, your response should include:
(1) The results of any reassessment of your present scram system to confirm conforrance with the General Design Criteria (Appendix A to 10 CFR 50).
(2) A cemitment to reevaluate your present scram system and modify it as necessary to meet the additional design and performance cr.iteria developed by the Owners Sub-Group.
(3) A cocinit:nent to provide by December 15, 1980, the results of the above reevaluation (including required modifications) along with a schedule for iglementation.
If you have any questions concerning this matter, please call your Project Manager.
Sincerely, Darrell G. Eisenhut, Director
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Division of Licensing cc: Service Lists
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