ML20094F530
| ML20094F530 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/31/1984 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| SBN-699, NUDOCS 8408100083 | |
| Download: ML20094F530 (4) | |
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SWROO STATION IPUE3LIC SERVICE Lngineering Office:
Companyof NewHampshre 1671 Worcester Road Framinoham, Massachusetts 01701 (617) - 872 8100 July 31, 1984 SBN-699 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 October 24, 1983, A. L. Legendre (YAEC) to Harry Kister (NRC Region I)
(c) PSNH Letter, dated November 23, 1983, " Interim 10CFR50.55(e) Report; Pacific Scientific Mechanical Shock Arrester Capstan Spring", J. DeVincentis to R. W. Starostecki (d) PSNH Letter, dated January 13, 1984, " Interim 10CFR50.55(e)
Report; Pacific Scientific Mechanical Shock Arrester Capstan Spring" J. DeVincentis to R. W. Starostecki (e) PShH Letter, dated February 28,1984, " Interim 10CFR50.55(e) Report; Pacific Scientific Mechanical Shock Arrester Capstan Spring", J. DeVincentis to R. W. Starostecki (f) PSNH Letter, dated June 1, 1984, " Interim 10CFR50.55(e)
Repo rt; Pacific Scientific Mechanical Shock Arrester Capstan Spring", J. DeVincentis to R. W. Starostecki
Subject:
Interim 10CFR50.55(e) Report; Pacific Scientific Mechanical Shock Arrester Capstan Spring
Dear Sir:
On October 24, 1983, we reported a potential 10CFR50.55(e) deficiency to Region I [ Reference (b)], regarding cracked capstan springs in Pacific Scientific mechanical shock arresters.
It has been determined that this item is reportable under 10CFR50.55(e).
The following information is being filed pursuant to the interim reporting provision of 10CFR50.55(e)(3).
8408100003 040731 PDR ADOCK 05000443 6
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United States Nuclear Regulatory Commission July 31, 1984 Attention:
Mr. Richard W. Starostecki, Director Page 2 i
i A.
Description of Deficiency We were informed by our eupplier ITT-Grinnell, on October 5,1983, that a Capstan Spring Potential Quality Problem was reported on PSA-1 and PSA-3 shock arrestors manufactured by Pacific Scientific 1
Company. Failures of shock arresters from these model numbers l'
occurred during testing at Union Electric's Callaway Station. The failures were attributed to Capstan Spring tangs severance af ter the shock arresters were tested for a small number of cycles. An examination performed by Callaway personnel on Capstan Springs in the remaining untested shock arresters revealed the presence of micro cracks on the spring tangs. At Seabrook Station, we have 4-forty-eight shock arresters that are either the PSA-1 or PSA-3 model types.
An independent metallurgia1 analysis was performed on capstan springs from the PSA-1 and PSA-3 lot.
Some of the springs examined I
exhibited cracking and some of the springs received had tangs I
completely severed. The metallurgical analysis concluded that the spring cracking is attributed to impro,per forming of the spring tangs during manufactt ring. The manufacturer of the springs which are experiencing cracking probicms formed the spring tangs after age L
hardening at 9000F.- High residual stresses resulted from this forming process and caused hydrogen cracking during subsequent plating. The report also states that another spring manufacturer forms the spring tangs prior to age hardening, and these tangs do I
not experience any cracking problem.
We have returned all forty-eight shock arrestors to Pacific 4
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Scientific for Capstan Spring examination. To date, eight shock arresters have been identified as having capstan springs which l
exhibit micro cracks.
l l
Based upon the discovery of cracked capstan springs in our shock I
arrestors and the quick failures of PSA-1 and PSA-3 shock arrestors during testing at Callaway Station, we feel. that some of our PSA-1 and PSA-3 shock arresters could become inoperable.
3 l
B.
Analysis of Safety Implications The failure of these shock arrestors could affect the operability of the safety-related piping systems that are supported by these shock arresters.
C.
Corrective Action As previously stated, we have returned all suspect shock arresters to Pacific Scientific for examination. A11' springs exhibiting micro cracks will be replaced. All springs whose tangs were formed prior to age hardening will also be replaced. All snubbers which have springs ' replaced will be tested and recertified.
United States Nuclear Regulatory Commission July 31, 1984 Attention:
Mr. Richard W. Str.rostecki, Director Page 3 l
We will notify Region 1 when the above corrective actions are completed.
Very truly yours, J. DeVincentis Engineering Manager cc: - Atomic Safety and Licensing Board Service List Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 l
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.e William S. Jordan, III Dians Curran Harmon, Wsica & Jordin Brentwood Board of Selectmen 20001 S Street N.W.
RED Dalton Road Suite 430 Brentwood, New Hampshire 03833 Washington, D.C.
20009 Roy P. Lessy, Jr., Esquire Office of the Executive Legal Director Edward F. Meany U.S. Nuclear Regulatory Commission Designated Representative of Washington, DC 20555 the Town of Rye 155 Washington Road Robert A. Backus, Esquire Rye, NH 03870 116 Lowell Street P.O. Box 516 Calvin A. Canney Mancehster, NH 03105 City Manager City Hall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Department of the Attorney General Augusta, ME 04333 Dana Bisbee, Esquire Assistant Attorney General Mr. John B. Tanzer Office of the Attorney General Designated Representative of 208 State House Annex the Town of Hampton Concord, NH 03301 5 Morningside Drive Hampton, NH 03842 Anne Verge, Chairperson Board of Selectmen Roberta C. Pevear Town Hall Designated Representative of South Hampton, NH 03842 the Town of Hampton Falls Drinkwater Road Patrick J. McKeon Hampton Falls, NH 03844 Selectmen's Office 10 Central Road Mrs. Sandra Gavutis Rye, NH 03670 Designated Representative of the Town of Kensington Carole F. Kagan, Esq.
RFD 1 Atomic Safety and Licensing Board Panel East Kingston, NH 03827 U.S. Nuclear Regulatory Commission Jo Ann Shotwell, Esquire Assistant Attorney General Mr. Angie Machiros Environmental Protection Bureau Chairman of the Board of Selectmen Department of the Attorney Ceneral Town of Newbury One Ashburton Place, 19th Floor Newbury, MA 01950 Boston, MA 02108 Town Manager's Office Senator Gordon J. Humphrey Town Hall - Friend Street U.S. Senate Amesbury, Ma, 01913 Washington, DC 20510 (Attn: Tom Burack)
Senator Cordon J. Humphrey 1 Pillsbury Street Diana P. Randall Concord, NH 03301 70 Collins Street (Attn Herb Boynton)
SEmbrook, NH 03874 Richard E. Sullivan, Mayor Donald E. Chick City Hall Town Manager Newburyport HA 01950 Town.of, Exet er 10 Front, Street E(eter, NH 03833
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