ML20141B904
| ML20141B904 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/03/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-988, NUDOCS 8604070144 | |
| Download: ML20141B904 (3) | |
Text
1 SEABROOK STATION Engineering Office gmggg April 3, 1986 New Hampshire Yankee Division TF
.1.2 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Neonan, Project Director PWR Project Directorate No. 5
References:
(a) Construction Permits CPPR-135 and CPPR-136 5
Docket Nos. 50-443 and 50-444 (b) Environmental Qualification Site Audit, February 24-27, 1986 Subj ect:
Environmental Qualification; Post Accident Operability Time
Dear Sir:
As a result of the recent NRC EQ site audit, Reference (b), the Staff indicated they were not in agreement with the Seabrook methodology in applying the Arrhenius equation to calculate the post-accident operability time. In subsequent discussions, we proposed a more conservative approach to the Staff and provided examples of how this approach would be implemented.
In a telecon on March 31, 1986, we were informed by the Stafi that the exam--
ples were acceptable.
We have now completed recalculating the post-accident operability times for all the EQ equipment files currently issued (109 of a total 115 files). We have followed the same approach used in the examples provided to the Staff and in all cases have taken no credit for any portion of the test curve which enveloped the transient portion of the postulated uccident pro-file. The results of this reanalysis indicate that, with the exception of the following, all files currently issued meet the 40-year normal operating life plus one-year post-accident life.
EQ File Post-Accident Number of Number Description Operating Time Items 174-00-01 Foxboro Transmitters 100 days 13 items 252-38-01 ASCO Temperature Switches 30 days 4 items 600-01-01 Raychem HKV Motor Connector Kits 100 days 13 items 173-05-03 Maisoneilan E/P Converter 100 days 4 items 248-36-01 Borg-Warner Feedwater 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4 items Isolation Valves 8604070144 860403 k
l, Od PDR ADOCK 05000443 A
pog i
i g Secbrook Station Construction Field Office. P.O. Box 700 Seabrook, NH 03874 i
L
8 Unit:d Stctco Nuciscr R:gulctory C=miscion April 3, 1986 Attention:
Mr. Vincent S. Noonan, Project Director Page 2 In all the above cases, the post-accident operating time has addi-tional margin to meet the performance margin requirements of IEEE 323, 1974.
From our discussions with the Staf f during the site audit, engineer-ing jpstifications for post-accident operating times of 100 days or longer is not required. Therefore, the following is our engineering justification con-cerning the acceptability of the post-accident operating time for EQ File No.
252-38-01 (ASCO Temperature Switches) and EQ File No. 248-36-01 (Borg-Warner Feedwater Isolation Valves).
The Feedwater Isolation Valves (File 248-36-01) are required to close in a harsh environment created by a postulated nonsechanistic pipe rupture in the main steam and feedwater pipe chase. The feedwater and steam piping in this area is designed under the concepts of "Superpipe".
Our en-gineering analysis conservatively has determined valve closure would occur in less than one minute. The plant would be safely shut down using the Auxiliary Feedwater System, which does not require operation of the Feedwater Isolation Valves, Control Room indication of these valves can be relied upon for a longer duration than four hours because the Namco 180 Limit Switches are qualified for one year post-accident operation.
We have concluded that the four-hour post-accident operability qualification has sufficient margin to ensure the required safety function has been performed.
The ASCO Temperature Switches (File 252-38-01) are located in the Primary Auxiliary Building in the vicinity of the Primary Component Cooling Water Pumps.
In the event of HELB in this area, the switches automatically start safety grade fana (PAH-FN-42 A and B) to provide HVAC services for the PCCW pumps.
The fans have a continuous run feature that can be used to operate the fans if the temperature switches fail.
Also, separate high temperature alarm and nonsafety grade HVAC fans normally provide cooling ventilation for the PCCW pumps.
In conclusion, the 30-day post-accident operability qualification has sufficient margin for the required immediate safety function of providing safety grade HVAC cooling.
The remaining six EQ file packages are in final review.
We will use the same methodology for determining post-accident oferability times for these packages as previously discusssed.
We will notify you when our review is complete and will identify those items, if any, that do not meet the one-year post-accident operability.
The information provided in this letter is intended to satisfy the Staf f on the Seabrook methodology used calculating post-accident operability time. Accordingly, we request that the acceptability of Seabrook's methodol-ogy for calculating post-accident operability time he reflected in the next supplement to Seabrook's SER.
Very truly yours, A
j ohn DeVincentis, Director Engineering and Licensing Enclosures cc: Atomic Safety and Licensing Board Service List
Dicn3 Curren P:tsr J. Mathiwa, Mayce Hamon & Weiss City Hall 20001 S. Street N.W.
Newburyport, MA 01950 Suite 430 Washington, D.C.
20009 Calvin A. Canney City Manager Sherwin E. Turk, Esq.
City Hall Office of the Executive Legal Director 126 Daniel Street U.S. Nuclear Regulatory Commission Portsmouth, NH 03801 i
Washington, DC 20555 Stephen E. Merrill Robert A. Backus, Esquire Attorney General 116 Lowell Street Dana Bisbee, Esquire i
P.O. Box 516 Assistant Attorney General i
Manchester, NH 03105 Office of the Attorney General 1
25 Capitol Street Philip Ahrens, Esquire Concord, NH 03301-6397 Assistant Attorney General Department of The Attorney General Mr. J. P. Nadeau Statehouse Station #6 Selectman's Office Augusta, ME 04333 10 Central Road Rye, NH 03870 Mrs. Sandra Cavutis Designated Representative of Mr. Angie Machiros the Town of Kensington Chairman of the Board of Selectmen RED 1 Town of Newbury East Kingston, NH 03827 Newbury, MA 01950 Jo Ann Shotwell, Esquire Mr. William S. Lord Assistant Attorney General Board of Selectmen Environmental Protection Bureau Town Hall - Friend Street Department of the Attorney General Amesbury, MA 01913 One Ashburton Place, 19th Floor Boston, MA 02108 Senator Gordon J. Humphrey 1 Pillsbury Street Senator Gordon J. Humphrey Concord, NH 03301 U.S. Senate (ATTN: Herb Boynton)
Washington, DC 20510 (ATTN: Tom Burack)
H. Joseph Flynn Office of General Counsel Diana P. Randall Federal Emergency Management Agency 70 Collins Street 500 C Street, SW Seabrook, NH 03874 Wa:2hington, DC 20472 Richard A. Hampe. Esq.
Matthew T. Brock, Esq.
Hampe and McNicholas Shaines, Madrigan & McEachern 35 Pleasant Street 25 Maplewood Avenue i
l Concord, NH 03301 P.O. Box 360 Portsmouth, NH 03901 Donald E. Chick Town Hanager Gary W. Holmes,.Esq.
Town of Exeter Holmes & Ells 10 Front Street 47 Winnacunnet Roed Exeter, NH 03833 Hampton, NH 03841 Brentwood Board of Selectn.2n Ed Thomas RFD Dalton Road FEMA Region I Brentwood, NH 03833 John W. McCormack PO & Courthouse Boston, MA 02109
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