ML20050B151

Forwards Final Response to IE Bulletin 81-02,Suppl 1 & Deficiency Rept 81-03 Re Failure of gate-type Valves. Byron Mods Completed.Encl Lists Mods Required to Be Made to Braidwood.Completion Expected by 830401

ML20050B151
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	03/25/1982
From:	Swartz E COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-SSINS-6820 3723N, IEB-81-02, IEB-81-2, NUDOCS 8204050047
Download: ML20050B151 (6)

Text

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              / one First Nat+onal Piara. Chicago, lihnois
 ,         O      Address Reply to Post Office Bil767 Chicago, Ilknois 60690 March 25, 1982 s            e f

Mr. James G. Keppler, Regional Administrator 9 Directorate of Inspection and  ; ,4ESg Ell /gp 2\ Enforcement - Region III -

                                                                                                                                      ~

U.S. Nuclear Regulatory Commission 9 799 Roosevelt Road Glen Ellyn, IL 60137 4 / W N

Subject:

Byron Station Units 1 and 2 Braidwood Station Units 1 and 2

1) Final Response to I.E. Bulletin 81-02 Supp1 ment 1, " Failure o f Gate Type Valves to Close Against Dif ferential Pressure"

2) Final Response to 50.55(e)

Deficiency Report 81-03 NRC Docket Nos. 50-454/455/456 and 457 Reference (a): E. D. Swartz letter to J. G. Keppler dated Novembe r 16, 1981. Dea r Mr. Keppler: In Reference (a), we indicated that the specific modifications required as a result of the subject Bulletin 81-02 for our Braidwood Station Units 1 and 2 were expected to be determined by March, 1982. Additionally, we stated that the schedule for completion of the Byron Unit 2 and Braidwood Units 1 and 2 modifica-tions would be submitted by April 1, 1982. This letter along with its enclosure is intended to provide our final response to I.E. Bulletin 81-02, Supplement 1 and the final response to our 10 CFR 50.55(e) De ficiency Report 81-03. The modifications identified in Reference (a) for Byron Units 1 and 2 have been completed. The enclosure to this letter identifies the modifications required for Braidwood Units 1 and 2. We anticipate that modifications will be completed by April 1,1983, however this schedule is dependent upon the installation schedule for the affected valves. The instructions for the required modifications have been received by the site. MG 2 9 E02' 8204050047 820325 PDR ADOCK 050004S4 P" 6/[ L I _ _ _ _ _ _ //h a

P J. G. Keppler March 25, 1982 contained herein are true and correct.To the best o f my knowledge F. information furnished by other Commonwealth n employees. Edisostate Such information practice and I believehas it to been reviewed in accordance be reliable. ompany with C may have concerning this matter to this officePlease . our staf address f Very truly yours, [ ' E. Douglas Swa rtz Nuclea r Licensing Adminis trator 1m Enclosure cc: Director, NRC Of fice o f Inspection and Enforcement Region III 1spector - Byron Region III Inspector - draidwood SUBSCRIBED and SWOHN to before af d)RmeA this tt) , _7 Ic/s 1982 day ( e <? [e > (l Notary i

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                         .ic 3723N

f ENCLOSURE COMMONWE ALTH EDISON COMPANY BYRON STATION UNITS 1 and 2 BRAIOWOOD ST ATION UNITS 1 and 2 FINAL RESPONSE TO I.E. BULLETIN 81-02 SUPPLEMENT 1 FINAL RESPONSE TO 10 CFR 50.55(e) DEFICIENCY REPORT 81-03 3723N

ATTACHMENT Valve W EMD Consequence Braidwood Sta. Valve Location Rodel Maximum of Failure to Required Function Number Reference P (psi)-{l) Close Modification VCT Outlet LCV-1128,C 4GM72FB 100 Failure of either of two valves Unit 1 - A in series to close reduces Unit 2 - None redundancy of providing isolation. Alternate valve will provide isolation. RWST to LCV-1120,E 8GM72F8 200 Failure of either of two valves Unit 1 - B Suction CCP in parallel from the RWST to the Unit 2 - A suction of the CCP's reduces redundancy of providing isolation of RWST during the recirculation phase following a LOCA. Isolation will be provided by a check valve in series with the two paths. RHR Suction 87018 12GM88SEH 700 Failure of either of the two C Isolation 87028 inner isolation valves in (Inner) series to close reduces the redundancy of providing isolation. Isolation is provided by closing the outer valve. RHR Suction 8701A 12GM88SEH 700 Same as 87018/87028 except for C Isolation 8702A closing the inner valves. (Outer) (1) As flow approaches zero, final functional requirement. A: Adjust open and close torque switchsetting. B: Change to limit control closure, change gear ratio. C: Change to limit control closure

Valve W EMD Consequence Braidwood Sta. Valve Location Model Maximum of Failure to Required F_unc t io_n Number _Ref erenc_e P (psi) (1) Close Mod if_ic_at ion RHR 8716A, B 8GM 74FE 300 Failure of either of the two Unit 1 - B,C Discharge valves in series to close reduces Unit 2 - C redundancy of providing low head , train separation during cold leg recirculation phase following a LOCA. Train separation can be achieved by closing other valve. RHR Heat 8804A 8GM84FE 300 Failure of valve to close C Exchanger precludes realignment of RHR for Discharge to normal operation. (Valve is CCP Suction opened for recirculation phase following a LOCA). RHR Heat 88048 8GM74FE 30 0 Same as 8804A C Exchanger Discharge to SI Pump Suction RWST to SI JB;806 8GM72FB 200 If valve fails to close, A Pump Suction backflow into RWST would be prevented by a check valve. . (Valve is closed for recirculation phase following a LOCA). (1) As flow approaches zero, final functional requirement. A: Adjust open and close torque switch setting. B: Change to limit control closure, change gear ratio. C: Change to limit control closure.

Valve y EMD Consequence Braidwood Stat. '. Valve Location Model Maximum of Failure to Required F_unct ion Number Reference P_ (psi) (1) Close Modi _fication CCP Suction 8807A,B GR 6GM72FB 200 There are two valves in parallel A SI Pump '8924 GR (8807A,3) in series with one A Suction (8924). Failure of any of these Crossover valves to close will not preclude isolation. SI Pump 8923A,8 GR 6GM72FB 200 If either valve fails to close, None Suction the other valve will provide the None Cross Connect separation. (Valves are closed to provide SI pump train separation). Accumulator 8808A,B,C,0 10GM88FN 0 Valve is closed to prevent RCS None Discharge pressurization during cold shut-down operation. If valve fails to close, the accumulator may be depressurized by venting the N2 to containment. HHR Cold 8809A,8 8GM78FN 200 Valve is closed for switchover None Leg Injection from cold leg to hot leg recirculation. Failure of valve to close will degrade flow to hot legs. (1) As flow approaches zero, final functional requirement. A: Adjust open and close torque switch setting. B: Change to limit control closure, change gear ratio. C: Change to limit control closure. 090lb*}}