ML20032E812
| ML20032E812 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/13/1981 |
| From: | Johnson W PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 IEB-81-02, IEB-81-2, SBN-189, NUDOCS 8111230311 | |
| Download: ML20032E812 (5) | |
Text
l pWEBLJC SERVICE companyof New HemymNre SEAB800KSTATION Engineering Office:
1671 Worcester Road Framingham, MA 01701 November 13, 1981
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United States Nuclear Regulatory Commission Wise M
Region l g
631 Park Avenue O
9 King of Prussia, PA 19406 Atten tion :
Mr. Boyce Grier
References:
(a) Cons truction Pe rmits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b)
IE Bulletin 81-02, Supplement 1, dated Augus t 18, 1981
Subject:
Response to IE Bulletin 81-02, Supplement 1, " Failure of Gate-Type Valves to Close Against Differential Pressure"
Dear Mr. Grier:
To date, PSNH has made :nitial phone notification and 30-day written follow-up reports [per 10CFR 50.55(e)] on the following Westinghouse motor operated gate valve sizes which have failed to tightly seal against differential pressure when tested at their service cond'itions or through analytical methods:
Phone October 30, 1981, 3-inch val 9 February 12, 1981, 4-inch valve June 17, 1981, 6-inch to 18-inch valves 30 Day December 1, 1980, 3-inch valve Report March 13, 1981, 4-inch valve July 17, 1981, 6-inch to 18-inch valves IE Bulletin 81-02 was issued on April 9, 1981, to identify the 3-inch and 4-inch ga te valve closure f ailuces. PSNH responded to IE Bulletin 81-02 on July 8,1981, by referencing a PSNH letter, dated May 1,1981, which described our test program and corrective modifications on the 3-inch valve (to close the 10CFR 50.55(e) loop for the 3-inch valve). Testing of the 4-inch valve was not complete at the time of the IE Bulletin 81-02 response.
' The 30-day written follow-up report for the 6-inch to 18-inch valves committed to a final report (which would also include the 4-inch valve) by June, 1982.
In the interim and as a partial fulfillment of the actions required by Reference (b), PSNH has taken the following action:
81112303Il 811113 l
{DRADOCK 00000443
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Mr. Boyce Grie r Novembe r 13, 1981 Page 2 (1) Identification of the affected valves; (2) Their planned service; (3) The maximum diff erential pressure at which they would be required to close; and (4) The safety consequences of the valve's failure to close.
Table 1 (attached) provides a tabulation of the above items.
Corrective modifications to the 4-inch to 18-inch valves will be presented in the June, 1982 report.
Two hundred man-hours were spent in responding to this Bulletin.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY u.( v;s;.
W. @ Johnson Vice President Attachment cc:
Mr. Robert C. DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 COMMONWEALTH OF MASSACHUSETTS)
)ss MIDDLESEX COUNTY
)
Then personally appeared before me, W. P. Johnson, who, being duly sworn, did sta te that he is a Vice President of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Public Service Company of New Hampshire, and that the statements therein are true to the best of his knowledge a d belief.
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Allen L. Leged4&( JU Notp Pu'91c My Commission Expires August 5, 1588 y'
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TABLE 1 page 1 'of 3
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MAXIhD1 P (psi) AS FIDW APPROACHES ZERO VALVE W DD FINAL VALVE LOCATION F0 DEL EQUIP.
FUNCTIONAL FUNCTION MNBER REFERENCE SPEC REQUIRDIENT CONSEQUENCE OF FAILURE TO CLOSE (item 2)
(item 1)
(item 1)
(item 3)
(item 4)
VCT Outlet LCV-112B,C 4G172FB 20$
1$$
hu valves in series; failure of either valve to close reduces redundency of providing isolation. Altemate valve will provide isolation.
RWST to LCV-112D,E 8G172FB 2$$
2$$
One MOV in each of two parallel paths Suction from the RWST to suction of the CCP's, of failure reduces redundancy of providing CCP's-isolation of RWST during the recircula-tion phase following a LOCA.
Isolation will be provided by a check valve in i
series with the two paths.
RHR Suction 87$1B 12G188SE 7$$
750 Two valves in series; failure of inner Isolation, isolation valve to close reduces redun-Inner dancy of providing isolation.
Isolatiog isprovidedbyclosingtheoutervalve.I 8752B 12G186SE 75$
75$
Two valves in series; failure of inner
/
isolation valve to close reduces redun-j dancy of providing isolation.
Isolatial
{
is provided by closing the outer valve.'
l RHR Suction 8701A 12G188SE 75$
7$$
Two valves in series; failure of outer Isolation, isolationvalvetoclosereducesredun-)
Outer dancy of providing isolation.
Isolatioe j
is provided by closing the inner valve.
87$2A 12G188SE 75$
750
%o valves in series; failure of outer
' 1 isolation valve to close reduces redun i is provided by closing the inner valve.q dancy of providing isolation.
Isolatio
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pags 2 of 3 TABLE 1 4
M\\XIMJM P (psi) AS FwW APPROACHES ZERO i
VALVE W EMD FINAL VALVE IDCATION FIODEL EQUIP.
FUNCTIONAL FUNCTION NUMBER REFERENCE SPEC REQUIREMENT CONSEQUENCE OF FAILURE TO CLOSE (item 2)
(item 1)
'(item 1)
(item 3)
(item 4) l
' RIR Dis-8716A,B 8G174FE 7$$
35$
Failure of valve to close reduces redun-charge dancy of providing low head train sepa-Cross ration during CL recirculation phase-Connect following a LOCA. Train separation can be achieved by closing other valve.
RIIR IIX 88$4A 8G174FE 7$$
30$
Valve is opened for recirculation phase Discharge following a LOCA. Failure of valve to to CCP close precludes realignment of RIES for-
{
Suction nomal operation.
i l
RIR IIX 8854B 8G174FE 75$
35$
Valve is opened for recirculation phase Discharge following a LOCA. Failure of valve to to SI close precludes realignment of RIES for pump suction normal operation.
RWST to SI 88$6A,B 8G172FB 2$$
2$$
Valve is closed for recirculation phase-pump following a LOCA.
If valve fails to suction close, backflow into RWST is prevented by check valve in line.
CCP Suction 8867A,B 6G172FB 2$$
20$
Two valves in parallel (8801A,B) in ser-to SI pump ies with one valve (8924); failure of suction any one valve to close will not preclude; crossover isolation.
8924 6G172FB 2$$
2$$
Two valves in parallel (8851A,B) in ser-ies with one valve (8924); failure of any one.ialve to close will not preclude.
isolation.
I
TABLE 1, page 3' af 3 '.
MAXIMUM P (psi) AS FIUd APPROACHES 2ERO VALVE W EMD FINAL VALVE LOCATION MODEL EQUIP.
FUNCTIONAL FUNCTION NUMBER REFERENCE SPEC REQUIREMENT CONSEQUENCE OF FAILUR" 'IO CIDSE (item 2)
(item 1)
(item 1)
(item 3)
(item 4)
Accumulator 8808 10G188FN 2759 Valve is closed to prevent RCS pressurit Discharge A,B,C,D tion during cold shutdown operations.
1 the valve fails to close, the accurulato may be depressurized by venting the N, 8 the containment.
RHR Pump 8859 A,B 8G178FN 2755 25$
'/..
s
' Valve is closed for switchover from CL t CL Injec-HL recirculation. Failure of valve to j
- tion, close will degrade flow to HL's.
I RNST to 8812 A,B 12G174FE 75$
IS$
Valve is closed for recirculation phase RIR pump following a LOCA.
If valve fails to clo suction backflow into RWST is prevented by check valve in line.
Sump 8811 A,B 16G174FE 75$
15'$
Valve is opened for recirculation follow Suction ing a LOCA. Valve would be closed for containment isolation. Valve is encap-sulated within a protective housing whic acts as the redundant containment isola-tion.
SI Pump 8821 A,B 4G177FH 155$
155$
Valve is closed for switchover from.CL t HL recirculation.
If valve fails to c1c alternate isolation valve 8885 can be l
{ "'
closed. -
2$$
Valve is closed for switchover from HL t l
Discharge CL recirculation following a LOCA.
If to HL valve fails' to close, isolation is provi ded by closing the RHR discharge cross connect valves.
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.