ML20064N327
| ML20064N327 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/23/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, SBN-317, NUDOCS 8209080311 | |
| Download: ML20064N327 (6) | |
Text
{{#Wiki_filter:r SEABROOK STATION l PUBLIC SERVICE Engineesing Omce-Companyof New Hampshie a 1671 Worcester Road Framingham, Massachusetts 01701 (617) - 872-8100 August 23, 1982 SBN-317 T.F. Q 2.2.2 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Resident and Project Inspection
References:
(a) Construction Permit CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter, dated November 13, 1981, " Response to IE Bulletin 81-02, Supplement 1, ' Failure of Gate-Type Valves to Close Against Differential Pressure'," W. P. Johnson to B. Grier (c) PSNH Letter, dated July 17, 1981, " Reportable 10CFR50.55(e) Item 4" through 18" Motor-0perated Gate Valves Interim Report," J. DeVincentis to Office of Inspection and Enforcement (d) PSNH Letter, dated May 1, 1981, " Reportable 10CFR50.55(e) Item - Westinghouse 3-Inch Motor-Operated Valves," J. DeVincentis to Office of Inspection and Enforcement
Subject:
Final 10CFR50.55(e) Report; Westinghouse Motor-Operated Gate Valves (4-Inch to 18-Inch)
Dear Sir:
Reference (b) and (c) committed to providing a final report on the corrective modifications made on Westinghouse manufactured 4-inch to 18-inch motor-operated gate valves which have failed to tightly seal against differential pressure when tested at their service conditions or through analytical methods. Reference (b) provided the following information for the subject valves scheduled to be utilized in Seabrook Station Unit 1 and Unit 2: Valve Function Valve Location Number W EMD Model Reference Number Tiaximum Delta P (psi) as Flow Approaches Zero g Consequence of Failure to Close 8209080311 820023 PDR ADOCK 05000 S
i UnJted States Nuclear Regulatory Commission August 23, 1982 Attention: Mr. Richard W. Starostecki Page 2 I have attached Table 1 which provides the above information from Reference (b) and also includes the corrective modifications, if required. Reference (d) provided the corrective modifications made to the 3-inch valves; however, two 3-inch valves were inadvertantly omitted. These valves and the corrective modifications are included in Table 1. Very truly yours, Y E TOMIC ELECTRIC COMPANY Md J. DeVincentis Project Manager i i e L
TABLE 1 MAXIMWi P (psi) AS FLOW APPROACHES ZERO VALVE W EMD FINAL E. my r Ls inCATI0a w s MOD u c. u..r,QUIr, ..- M CTIONAL -_ m a qw-...aj a. _ - - - - - - - - --.. 6 rex m ga y = FUNCTIO N NUMBER REFERENCE SPEC REQUIREMENT CONSEQUENCE OF FAILURE TO CLOSE CORRECTIVE MODIFICATIONS VCT Ou t le t LCV-1L2B 4GM72F8 200 100 Two valves in sectes; f atture of either Torque switch adjustment valve to close reduces redundancy of providing isolation. Alternate valve will provide isolation. vCT Outlet LCV-112 C 4CM72FB 200 100 Two valves in series; f atture of either None required valve to close reduces redundancy of providing isolation. Alternate valve will provide isolation. RWST to LCV-112 D. E 8CM72FB 200 200 One MOV in each of two parallel paths f rom Adjusted torque switch settings Suction the RWST to suction of the CCPs fatture Changed gear ratto of CCPs reduces redundancy of providing isolation Changed torgue switch spring pack of RWST during the rectreulation phase following a LOCA. Isolation will be provided by a check valve in series with the two paths. RRR Suction 87018 12CM38SE 700 700 Two valves in series; f atture of inner Adjusted torque switch settings Isolation, isolation valve to close reduces Changed gear ratto Inner redundancy of providing isolation. Isolation is provided by closing the outer valve. 8702B 12CM38SE 700 700 Two valves in series; f ailure of inner Adjusted torque switch settings isolation valve to close reduces Changed gear ratto redundancy of providing isolation. Isolation is provided by closing the outer valve. RHR Suction 8701A 12CM38SE 700 700 Two valves in series; fatture of outer Adjusted torque switch settings Isolation, isolation valve to close reduces Changed gear ratto Inner redundancy of providing isolation. Isolation is provided by closing the Inner valve. s 1
?ABLE 1 i MAXIMUM P (psi) AS FLOW APPROACHES ZERO VA LVE W EMD FINAL wa.amvu.vt ww LOCKTIQh a.. **.m0 DEL.., _ u cQUIra.,. W rum,LLUNA14 ' ' M..A~~
- L M ' P -~ ' "5' " - - '=
FUNCTION NUM BER RE FERE NCE SPEC REQUIREMERT CONSEQUENCE OF FAILURE TO CLOSE CORRECTIVE MODIFICATIONS 8702A 12CM38SE 700 700 Two valves in series; fatture of outer Adjusted torque switch settings isolation valve to close reduces Changed gear ratto redundancy of providing isolation. Isolation is provided by closing the e inner valve. RHR Discharge 87164,5 8CM74FE 700 300 Failure of valve to close reduces Adjusted torque switch settings Cross Connect redundancy of providing low head train separation during CL rectreulation phase following a LOCA. ~ce'n separation can be achieved by clusing other valve. RHR HX 8804A 8CM74FE 700 300 Valve is opened for recirculation phase Adjusted torque switch settings Discharge following a LOCA. Failure of valve to to CCP close precludes realignment of RRRS for Suction normal operation. RHR HX 88048 8CM74FE 700 300 Valve is opened for rectreulation phase Adjusted torque switet. settings Discharge following a LOCA. Failure of valve to to Si close precludes realignment of RHRS for Pump Suction normal operation. RWST to SI 8806A.s 8CM72F8 200 200 Valve is closed for rectreulation phase Adjusted torque switch settings Pump Suction following a LOCA. If valve falls to Changed gear ratto close backflow into RWST is prevented Changed torque switch spring pack by check valve in line. CCP Suction 8307A,5 6CM72FS 200 200 Two valves in parallet (8807A,8) in None required to SI Pump series with one valve (8924); f a t tu re Suction of any one valve to close will not Crossover preclude isolation. 8924 6GM72FB 200 200 Two vsives in parattel (8807A,5) in Atjusted torque switch settings series with one valve (8924); f a t ture Changed gear ratto of any one valve to close will not Changed torque switch spring pack precluie isolation. ~
TABLE 1 MAXIMUM P (pst) AS FLOW APPROACHES ZERO "" = c at-v AT.Vr.a .....pu _ _ _ _ YJNAL u., w.., uA;_ ~
- _w g. A,,,
- _._ i s -: - c.; V A LVE LOCATION MODEL EQUIP. FUNCTIONAL FUNCTION NUM BER RE FERE NCE SPEC REQUIREMENT CONSEQUENCE OF FAILURE TO CLOSE CORRECTIVE MODIFICATIONS Accumula t o r 880 8 A, B,C, D 10CM88FN 2750 0 Valve is closed to prevent RCS None requ ire d Discharge pre ssurt sation during cold shutdown operations. If the valve fails to close, the accumulator may be depressurtzed by venting the N2 to the containment. RHR Pump SSO9A,5 8CM78FN 2750 200 Valve is closed for switchover f rom CL None re qu i re d CL to HL recirculation. Fallure of valve Injection to close will degrade flow to HLs. RWST to 8812A,8 12CM74FE 700 100 Valve is closed for recirculation phase None required RER Pump followi ng a LOCA. If valve falls to Suction close backflow into RWST is prevented by check valve in line. Sump 8811A,8 16CM74FE 700 100 Valve is opened for rectaculatto; None required Suction following a LOC A. Valve would be closed for containment isolation. Valve as encapsulated within a protective Sousing which acts as the reduniant contair. ment i sola t io n. S I Pum p 8821A,5 4GM77FH 1500 1500 Valve is closed for switche._c f rom CL to Adjusted torque switch settings HL rectreulation. If valve falls to Changed gear ratto close, Alternate Isolut ton Valve 8885 can Changed torque switch spring pack be closed. RHR HX 8340A,8 8CM78 700 200 Valve is closed for switchover f rom HL to Sane required Discha rg e CL rectreulation f ollowing a LOCA. If to HL valve fails to close, isolation is provided by closing the RHR discharge cross connect valves. s
._m. i I I j TABLE 1 i i MAXIMUM P (ps t) AS { FLOV APPROACHES ZERO - w....u 2,. A i . VAT.is.. _ q raut..-= ,FINA C " a.__ ....-'.ma._,_. =- - m -w.,. 4 FUNCTION NUM BER RE FERE NCE. EQUIP. FUNCTIONAL VA LV E LOCATION MODEL SPEC REQUIREMENT CONSEQUENCE OF FAILURE TO CLOSE CORRECTIVE MODIFICATIONS
- Chg. Line 8105,8106 3CM99 2750 2750 Two valves in series; f ailure of either Replace valves Isolation valve to close reduces redundancy of providing isoletton. Alternate valve will provide isolation.
- PORV Block 80004,8 3GM99 2750 2500 Valve is closed to isolate a leaking Replace valves or stuck open PORV.
Fatture of the 4 valve to close could result in a small j break LOCA. This accident is bounded by the analysts presented in Cahpter 15 4 of the FSAR. f
- SI System 8923A,8 6CM72FB 200 200 Valves are closed to provide S1 pump train Adjusted torque switch settings 1
separation. Two valves are present, Changed gear ratto ] f atture of one valve to close will not Changed torque switch spring pack preclude achieving separation.
- 5oron Injection 8801A,8 4GM88FN 2750 0
Valves are designed to open to perform Adjusted torque switch settings Tank Isolation their saf ety function. Failure to close Changed gear ratto i .would delay returning system to normal valve Itne-up.
- 3oron injection 8803A,8 4GM38FN 2750 0
- Valves are designed to open to perf orm Adjusted torque switch settings Tank Isolation their safety function. Failure to close Changed gear ratto would delay returning system to normal 4 ' valve Itne-up. i i 4
- Intivertantly omitted f rom Reference (d) i i
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