ML20137K703
| ML20137K703 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 01/07/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-86-063-000 CDR-85--20, CDR-85-00-20, PT21-86-063-000, PT21-86-63, SBN-921, NUDOCS 8601240191 | |
| Download: ML20137K703 (3) | |
Text
_ _ _ - _ _ _ _ _ _ _ _ _ _ _
O SEABROOK STATION Engineering Office Pub 5c Service of New Hampshko January 7, 1986 Now Hampshire Yankee Division SBN-921 T.F. Q2.2.2 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Mr. Richard W. Starostecki, Director Division of Project and Resident Programs
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) Telecon of December 6,1985, D. M. Pepe and D. E. Groves (YAEC) to Robert Gallo (NRC Region I)
Subject:
Interim 10CFR50.55(e) Report: Failure of Fire Damper to Close Under Design Airflow Conditions (CDR 85-00-20)
Dear Sir:
On December 6, 1985, we reported a potential 10CFR50.55(e) item to Region I [ Reference (b)]. The following information is being filed pursuant to the interin reporting provision of 10CFR50.55(e)(3).
A.
Description of Deficiency The standard for testing and qualification of fire dampers, UL 555, does not require testing of the fire dampers under airflow conditions. However, since some utilities have had experience with fire dampers failing to close under dynamic flow conditions, we tested 13 of our 90 fire dampers required for Appendix R of 10CFR50. Of the 13 tested under design flow conditions,11 failed to fully close. Upon shutdown of the airflow, some still remained partially open and would not close without assistance.
B.
Analysis of Safety Implications Failure of the fire dampers to close under HVAC system flow conditions violates the integrity of the fire barriers which could prevent safe shutdown of the plant due to a fire.
8601240191 860107 PDR ADOCK 05000443 S
PDR P.O. Box 300 + Seobrook.NH 03874 Torophone(603)474-9521 0
/
J
4 e
~
United States Nuclear Regulatory Commission Attention:
Mr. Richard W. Starostecki Page 2 i '
C.
Corrective Action It was determined that the fire dampers failed to close due to l
insufficient " pulling' forces" of the damper closure springs. As the fire damper partially closes, the HVAC System differential pressure at the ffre damper location increases the friction between the damper blades and the fire damper's guide tracks.
Calculations are being performed to determine which fire dampers would fail under dynamic flow condition and a test program is underway to verify the calculations and damper closure under operating airflow conditions.
For those fire dampers required for Appendir R of 10CFR50 which failed under test or have been identified by calculation, a
{
modification of stronger closure spring (if possible) and/or a dry lubricate spray coating of the damper guide tracks to reduce friction is being tested. Various dry lubricates are being reviewed for durability, reduction of friction, etc., and will be tested on dampers.
It is expected the above actions will be completed by February 28, 1986, at which time we will file an additional report.
Very truly yours, N
n John DeVincentis, Director Engineering and Licensing cc: Atomic Safety and Licensing Board Service List Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 l
I
_ _. - - _. ~. _ _ _.. _
William S. Jordan, Ill Donald E. Chick Diane Curran Town Manager Ha rmon, Weiss & Jordan Town of Exeter 20001 S. Street, N.W.
10 Front Street Suite 430 Exeter, NH 03833 Washington, D.C.
20009 Brentwood Board of Selectmen Robert G. Perlis RED Dalton Road Office of the Executive Legal Director Brentwood, NH 03833 U.S. Nuclear Regulatory Commission Washington, DC 20555 Richard E. Sullivan, Mayor City Hall Robert A. Backus, Esquire Newburyport, MA 01950 116 Lowell Street P.O. Box 516 Calvin A. Canney Manchester, NH 03105 City Manager City Hall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Augusta, ME 04333 Dana Bisbee, Esquire Mr. John B. Tanzer Assistant Attorney Gene ral Designated Representative of Office of the Attorney General the Town of Hampton 208 State House Annex 5 Morningside Drive Concord, NH 03301 Hampton, NH 03842 Anne Verge, Chairperson Roberta C. Pevear Board of Selectmen Designated Representative of Town Hall the Town of Hampton Falls South Hampton, NH 03827 Drinkwater Road Hampton Falls, NH 03844 Patrick J. McKeon Selectmen's Office Mrs. Sandra Cavutis 10 Central Road Designated Representative of Rye, NH 03870 the Town of Kensington RFD 1 Carole F. Kagan, Esquire East Kingston, NH 03827 Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Jo Ann Shotwell, Esquire Wa shi ng t on, DC 20555 Assistant Attorney General Environmental Protection Bureau Mr. Angi Machiros Department of the Attorney General Chairman of the Board of Selectmen One Ashburton Place, 19th Floor Town of Newbury Boston, MA 02108 Newbury, MA 01950 Senator Gordon J. Humphrey Town Manager's Office U.S. Senate Town Hall - Friend Street Washington, DC 20510 Amesbury, MA 01913 (ATTN: Tom Burac k)
Senator Gordon J. Humphrey Diana P. Randall 1 Pillsbury St reet 70 Collins Street Concord, NH 03301 Seabrook, NH 03874 (ATTN:
lierb Boynton) 4 m
_