ML19289F700
| ML19289F700 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 06/13/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19289F699 | List: |
| References | |
| NUDOCS 7906150368 | |
| Download: ML19289F700 (2) | |
Text
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i BALTI M ORE GAS AN D ELECTRIC CO M PANY GAS AN D ELECTRIC BUILDING BALTl M OR E, M ARYLAN D 21203 ARTHun c, LUNCVALL J a.
June 13, 1979 v.c c p.
..e a,
Su.nw e
Director Division of Resetor Operations Inspection Office of Inspection and Enforcement U. S. Nuclear Regulatory Co==ission Washington, D. C.
20555
Subject:
Calvert Cliffs Nuclear pcver plant Units Nos.1 & 2, Dockets Nos. 50-317 & 50-318 NRC IE 3ulletin No. 79-01
. Gentle =en:
IE 3ulletin 79-01 requested us to provide vritten evidence of the qualification of electrical equipment required to function under accident cenditions. We have been in the process of a document search of our CA files to retrieve the requested qualification data for your review and are continuing to do so.
Although a top priority has been assigned to this effort all along, we have not yet been able to complete it due to the extrenely time-consuming nature of conducting the document searches.
"he enclosed report sur-a-izes the qualificatien data ve have collected so far.
- he report is divided into three sections:
Section A identifies what syste=s and electrical co=ponents are required to function under accident conditions; Section B contains the co=ponent description and the environ =ent for which the ec=ponents are qualified with references to the supporting qualification documentation; and Section C describes the accident environ =ent.
Section A is referenced to Section 3 by a component number and to Section C by a location nu=ber.
The total number of entries in Section A vill increase as ve co=plete our identification of all equip-ment which =ust be environ =entally qualified.
Sectien 3 vill likewise increase as we confirm those qualifications. Section C is ec=plete with the exception of a fev locations vithin the Auxiliary Building.
For ec=ponents whose qualification data is not available, ve vill either determine their qualification by testing or engineering analysis, or ve vill replace them vith qualified equipment. We hope to co=plete the documentation search portion of our effort by October 31, 1979 and vill begin the testing, analysis, or replace =ent of applicable co=ponents as soon as practicable following identification. We share your concern on this subject and vill be pleased to submit updates of our report as often as you desire.
2230 212 7006150368
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Although we have not co=pleted our review of the environ = ental qualification of the eler trical equip =ent required to function under accident conditions, the data that we have reviewed thus far (approxi=ately 20% of the total) has supported such qualification with one notable exception. As called out in IE Bulletin 79-OlA, we have determined that ASCO solenoids are used for the contain=ent purge valves. We have deter-mined that this is not a significant safety issue because if the solenoids, half of which are inside of contain=ent, vould be required to operate to close the purge valves, then the fact that a purge was in progress at the time of a LOCA event vould mean that the purge lines vould serve to lessen the severity of the post-LOCA environ =ent, thus ensuring that the solenoid valves could then perfor= their design function at less than full post-LOCA conditions. Additionally, the solenoid valves for the outside purge valves are ~outside of contain=ent and would not see those conditions.
Nonetheless, ve have decided to prohibit operation of the contain=ent purge valves during power operation (Mode 1) until such time that the solenoid valves are replaced with qualified valves. To ensure their inhibition we are disconnecting the power leads to the valves.
We feel that the above infor=ation provides adequate assurance that there vill be no undue risk to the health snd safety of the public as a result of the continued operation of Unit No. 2 or the return to power operation of Unit No.1 following co=pletion of the refueling outage.
Very truly'yours, f -l
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J. A. Biddison, Esquire G. F. Trowbridge, Esquire Director Region I Office of Inspection & Enforce =ent U. S. Nt. clear Regulatory Co==ission 631 Park Avenue King of Prussia, PA 19h06 2230 213
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