ML20212K970
| ML20212K970 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 12/15/1986 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 8703100007 | |
| Download: ML20212K970 (3) | |
Text
{{#Wiki_filter:--. y 1 4 g 3 Y t a =,/ 4 UNITED STATES 8" i NUCLEAR REGULATORY COMiclSSION -{ f w4seawovow.o.c.20sss l ,/ December 15, 1986 y ....+ Docket No. 50-213 i M ...,, \\. Mr. Edward J. Mroczka, See.ior Vice President I Nuclear Engineering and Operations / Connecticut Yankee Atomic Power Company Post Office Box 270 ' i Hartford, Connecticut 06141-0270
Dear Mr. Mroczka:
n SU8 JECT: DEFERRAL OF COMPLETION DATE FOR SWITCHGEAR ROOM H LON SYSTEM FIRE PROTECTION MODIFICATIONS 8y letter dated August 25, 1986, the NRC granted the Connecticut Yankee Atomic Power Company (CYAPCo) an exemption from the schedular requirements 4 of 10 CFR 50.48 for the Haddam Neck Plant. This exemption was granted con-tingent on, among other things, the implementation of the commitments in the 5 July 3,1986 CYAPCo letter by January 1,1987. By letter dated November 24, 1986. CYAPCo requested NRC approval to defer completion of one constitment involving modifications to the switchgear room Halon system until an outage of at least 8 weeks duration after January 1,1987, or until the 1987 refueling outage. CYAPCo identified three specific concerns regarding modification of the switch-gear room Halon system while the plant is operating. CYAPCo concluded that there was a significant potential for damage to sensitive. safety-related equip-ment such as motor control center 5 (MCC-5), feederbreakers to MCC-5 and the semi-vital power-regulating transformers. MCC-5 is the only safety-related motor con-i trol center which automatically receives power upon.a loss of nonnal power and L...... .is.not single-failure protected. CYAPCo also concluded.that-there--was.high poten-tial for dust or debris to become lodged in a relay contact or armature which might result in an undetectable relay failure. This failure mode actually occurred at the Haddam Neck Plant.following plant modifications in the control room perfoM during the most recent outage. Lastly, CYAPCo concluded that work on the Halon system would require the system to be disabled. In addition, a large amount of combustibles, such as lumber, rags, solvents, etc., would be brought into the switchgear room and there is also the potential that some welding would need to be perfonned. CYAPCo concluded that the introduction of additional combustible materials and ignition sources into the switchgear room B703100007 861215 P PDR ADOCK 05000213 P pon _
O ~ ~- Edward J. Mroczka The staff has reviewed the information provided by CYAPCo and concurs with the CYAPCo assessment. With the deferral of the implementation date for system modification, the staff concludes that adequate fire protection of the switch- ~ gear room will still be provided by the currently installed and operable Halon system, the existing fire detection system and by the current fire watches (one ful time continuous and one roving watch) supplemented by manual fire fighting equ pment in the area. Based on the above and in accordance with the provisions of the schedular exemp-tion, the staff concludes that deferral of the implementation date for the switch-gear room modifications to a date no later than the completion of the 1987 refueling outage is acceptable. Sincerely, Harold R. Denton, Director , Nuclear Reactor Regulation cc: See next page-DISTRIBUTION: Docket File NRC PDR Local PDR ISAP RDG Frank Miraglia OELD EJordan BGrimes JPartlow NThompson FAkstulewicz PAnderson ACRS (10) i I D:DPLB DD:DPLB D:NRR FJMiraglia RVollmer HRDenton 12/ /86 12/ /86 12/ /86 ISAPD:h P)neeson D:ISAPD:k PEICSB: 4 AD:DPLB k I CGrimes U JCalvoO DCrutchfield FAkstu ewicz:dj 12/3 /86 12/3 /86 12/3 /86 12/3 /86 12/ /86 ( l [ 1
O O Mr. Edward J. Mroczka Connecticut Yankee Atomic Power Company Haddam Neck Plant cc: Gerald Garfield, Esquire Kevin McCarthy, Director Day, Berry & Howard Radiation Control Unit Counselors at Law Department of Environmental City Place Protection Hartford, Connecticut 06103-3499 State Office Building Hartford, Connecticut 06106 Superintendent !iaddam Neck Plant Richard M. Kacich, Supervisor RDF #1 Operating Nuclear Plant Licensing Post Office Box 127E Northeast Utilities Service Company East Hampton, Connecticut 06424 Post Office Box 270 Hartford, Connecticut 06141-0270 Wayne D. Romberg Vice President, Nuclear Operations Northeast Utilities Service Company Post Office Box 270 Hartford, Connecticut 06141-0270 Board of Selectmen Town Hall Haddam, Connecticut 06103 State of Connecticut Office of Policy and Management ATTN: Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06106 Resident Inspector Haddam Neck Nuclear Power Station c/o U.S. NRC-P. O. Box 116 East Haddam Post Office East Haddam, Connecticut 06423 l Regional Administrator, Region I i U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 l l .}}