ML20141E431

Final Deficiency Rept (CRD-85-00-13) Re Failure of Svc Water Sys Spool Linings,Piping Inserts & Valve Liner/Seats. Initially Reported on 850918.At Least One Piping Spool Will Be Removed for Insp of Coating During Each Outage

ML20141E431
Person / Time
Site:	Seabrook
Issue date:	04/10/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CRD-85--13), (CRD-85-00-13), SBN-1001, NUDOCS 8604210458
Download: ML20141E431 (4)

Text

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SEABROOK STATION Engineering Office  ;

=

f ggggg April 10, 1986 _

SBN- 1001 New Hampshire Yankee Division 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, Directo r Division of Project and Resident Programs m

c

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 -

2 (b) PSNH Letter SBN-874, dated September 18, 1985, " Interim =

10CFR50.55(e) R port: Service Water System Spool Linings,

Pipe Inserts an.1 Valve Liner / Seats", J. DeVincentis to =

=

R. W. Starostetki (c) PSNH Letter SBN-923, dated January 13, 1986, " Interim 10CFR50.55(e) Report: Service Water System Spool Lininga, Pipe Inserts and Valve Liner / Seats", J. DeVincentis to R. W. Starostecki Subj ect : Final 10CPR50.55(e) Report : Service Water System Spool _

{ Linings, Pipe Inserts and Valve Liner / Seats (CDR-85-00-13)

Dear Sir:

E In References (b) and (c), we reported a 10CFR50.55(e) deficiency

?

regarding the failure of Service Water System spool linings, piping

{ inserts and valve liner / seats. _

t Description of Deficiency During the startup testing of the Service Water System, it was discovered that:

o Some polyurethane linings in pipe spools downstream of

throttling valves had become detached.

o Some valve liners and seats were found cracked or bubbled.

o A polyurethar.e insert from the flanged end of the cement-lined pipe, adjacent to a safety-related valve, detached and

wrapped around the butterfly disc preventing the valve from closing.

i 8604210458 860410 -

PDR ADOCK 05000443 .

_ S PDR Seabrook Station Construction Field Office . P.O. Box 700 Seabrook, NH 03874 (\ J

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6 United 5tctco Nuclccr R;gulctory C:mmiccion Attention: Mr. Richard W. Starostecki Page 2 Safety Implications These deficiencies could cause the flow in either cooling train to become degraded and inhibit the ultimate heat sink function of the system.

Corrective Action After investigation of the failures, a modification program was developed which incorporated materials that have been sucessfully used in other nuclear power plants.

Corrective actions included:

o Replacing linings in polyurethane lined spools.

o Modifying butterfly valve seat design, i

l o Replacing polyurethane inserts at the flanged ends of

cement lined pipe.

o Installing orifice plates to help balance system flow.

The system was returned to service at the beginning of January, 1986. On March 28, 1986, the "A" & "B" service water trains were shutdown, for inspection. It was also planned to touch up a small chip in the spool coating on the flange upstream of the orifice plate l in the PAB, in the "B" train.

The inspection was conducted inside the components of the "A" PCCW heat exchanger outlet train, and inside the outfall lines downstream of I the isolation valves V-19 in the "A" train, and V-20 in the "B" train; and the common portion. The inspection showed that the protective coatings and cement lining are performing excellently.

The pipe spool immediately adjacent to the "A" PCCW heat exchanger 1 l

outlet valve (V-15) had four tiny spots of imperfection. Two of I these spots had coating removed, one with rusting and one with incip- l 1ent ru s t ing. One additional spot failed the high voltage test, and j the last spot had the first coat visible through the second coat which I is not acceptable; however, it passed the high voltage test, which l indicates that the coating in this area had maintained its integrity. l These spots are indicative of slight variances in the application of f the coating and do not indicate a generalized condition. Rather, the '

overall situation is indicated by the excellent condition of the coat-ings. It must be noted that these spots occurred where unavoidable heavy cavitation still occurs in the

• ect-dump-to-basin deicing mode of operation. This mode of operation will obviously be confined to to only short winter periods. The spots were touched up and the system returned to service. The "A" train was inspected because it had by far the most hours of service in the heavily cavitating direct-dump-to-basin deicing mode of operation.

• - * ' United Statsa Nuclect Rigulatory Commiccion Attention: Mr. Richard W. Starostecki Page 3 Based on the excellent performance of these protective coatings, we believe that the deficiency reported in References (b) and (c) has been correct ed.

We plan to remove at least one piping spool for inspection of coatings each refueling outage. This practice will continue until ex-perience dictates a more appropriate course of action.

We plan to recheck the touched up spots between hot operations and criticality.

No further reports on this deficiency are anticipated.

Very truly yours, 1 #

l -rA

/ John DeVincentis, Director Engineering and Licensing cc: Atomic Safety and Licensing Board Service Lis t Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

Diane Curran, Esquire Calvin A. Canney Harmon & Weiss. City Manager 2001 S. Street, N.W.

. City Hall Suite 430 126.Danic1 Street Washington, D.C. 20009 Portsmouth, NH 03801 Sherwin E. Turk, Esq. Stephen E. Merrill, Esquire Office of the Executive Legal Director Attorney General U.S. Nuclear Regulatory Commission George Dana Bisbee, Esquire Tenth Floor. Assistant Attorney General Washington, DC 20555 Office of the Attorney General

25. Capitol Street Robert A. Backus. Esquire Concord, NH 03301-6397 116 Lowell Street P.O. Box 516 Mr. J. P. Nadeau Manchester, NH 03105 Selectmen's Office 10 Central Road Philip Ahrens, Esquire Rye, NH 03870 Assistant Attorney General Department of The Attorney General Mr. Angie Machiros Statehouse Station #6 Chairman of the Board of Selectmen Augusta, ME 04333 Town of Newbury Newbury, MA 01950 Mrs. Sandra Gavutis Chairman, Board of Selectmen Mr. William S. Lord RFD 1 - Box 1154 Board of Selectmen Kennsington, NH 03827 Town Hall - Friend Street Amesbury, MA 01913 Carol S. Sneider Esquire Assistant Attorney General Senator Gordon J. Humphrey Department of the Attorney General 1 Pillsbury Street

One Ashburton Place, 19th Floor Concord, NH 03301 Boston, MA 02108 (ATTN: Herb Boynton)

Senator Gordon J. Humphrey H. Joseph Flynn, Esquire U.S. Senate Office of General Counsel Washington, DG 20510 Federal Emergency Management Agency (ATTN: Tom Burack) 500 C Street, SW Washington, DC 20472 Richard A. Hampe, Esq.

Hampe and McNicholas Paul McEachern, Esquire 35 Pleasant Street Matthew T. Brock, Esquire-Concord, NH 03301 Shaines & McEachern 25 Maplewood Avenue Donald E. Chick P.O. Box 360 Town Manager. Portsmouth, NH 03801 Town of Exeter 10 Front Street Cary W. Holmco, Esq.

Exeter. NH 03833 Holmes & Ells 47 Winnacunnet Road Brentwood Board of Selectmen Hampton, NH 03841 RFD Dalton Road Brentwood, NH 03833 Mr. Ed Thomas FEMA Region I Peter J. Mathews, Mayor 442 John W. McCormack PO & Courthouse City Hall. Boston, MA 02109 Newburyport, MA 01950 Stanley W. Knowles, Chairman Board of Selectmen P.O. Box 110 Morth Mamnton. Et n1867