ML19256F540
| ML19256F540 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/13/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7912190364 | |
| Download: ML19256F540 (3) | |
Text
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BALTIMORE GAS AN D ELECTRIC COMPANY GAS AN D ILECTRIC BUILDING BALTIMORE, MARYLAN D 21203 AnTHun E. LUNOVALL,JR.
v.c **.or."
December 13, 1979 Sweev Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Co:=nission Washington, D.C.
20555 Attn:
Mr. Darrel G. Eisenhut. Acting Director Division of Operating Reactors
Subject:
Calvert Cliffs Nuclear Pcwer Plant Units Nos. 1 & 2, Docket Nos. 50-317 & 50-318 Response to letter dated November 7, 1979 NRC Requirements for Auxiliary Feedwater Systems at Calvert Cliffs Nuclear Power Plant Gentlemen:
Mr. Eisenhut's letter dated November 7,1979 described the NRC reauirements for the auxiliary feedwater systcms at our Calvert Cliffs facility. We have evaluated the design and procedures at Calvert Cliffs against the applicable requirements specified in Enclosure 1 and hereby submit for NBC staff review the associated schedule and commitment for implementation of required changes and actions.
Short Tem Recommendations Recommendation #1 (GS-2): Monthly inspection of locked cpen valves in the AFW system shall be proposed for incorporation into the surveillance requirements of the plant Technical Specifications by January 1, 1980 as required by reco=mendation GS-2.
Recon =endation #2 (GS 4):
Dnergency procedures for transferring to alternate sources of AFW supply sh'111 be available to the plant operators by January 1,1980 as raluired by recon =endation GS h.
Recon =endation #3 (GG-5):
Dnergency procedures shall be established by January.1,1980 for manually initiating and controlling the auxiliary feedwater system on loss of all alternating current power.
It should be noted once ngain that cooling of AFW pump bearing lube oil does not depend on alternating mirrent power at Calvert Cliffs-The motor operated AFW pump turbine cteam supply valves represent the only feature of the system which depends an alternating current power.
Existing full flow manual '
bypasses around the steam supply MOV's would be opened if no alternating current power were available.
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Recoc:mendation #4 (GS-6):
Procedures shall be implemented by January 1, 198o to require indr g tent and redundant verification of proper alignment of AW system vives den an AW system flow train is returned to service after being out of tervice for periodic testing or maintenance. A Technical Specification requiring a AW system flow test prior to start-up following an extended cold shutdown will be proposed by January 1,1980.
Recommendation 85 (GS-8): A design modification to automatically initiate the AWS is currently under NRC review and was submitted in response to a reauirement of IGRM 0578.
Recommendation 86: A Technical Specification to require periodic testing of remotely operated valves will be pr,oposed by January 1,1980.
Additional Short-Tem Recomendations Recommendation $: Redundant condensate storage tank low level alarms are currently available in the control room. The setpoint provides the operator with more than Po minutes to line-up alternate water sources. A redundant level indication will be added as soon as practicable as part of our long-tem commitment to add a third pu=p train.
(See the discussion under Long-Tem Reccmmendations).
Recommendation #2: A 72-hour endurance test will be run on an AW system pump by January 1, 1980.
Recommendation #3:
Safety grade indication of auxiliary feedwater flow to each steam generator will be available in the control rocm by January 1,1980 in accordance with the requirements of IRTRm-0578. Upgrading of existing flow indication to safety-grade is currently in progress.
Recommendation #h: A Technical Specification requiring the stationing of a dedicated individual at manual valves res.ligned for periodic tests of an AW system train will be proposed by January 1,1980.
Long-Tem Recommendations Recommendation #1 (GL-1): A safety-grade auto start systen with manual start back-up is to be implemented by January 1, 1981 in accordance with NUR E 0578.
Preliminary design has begun. The auto-start scheme will include auto-stop of feed to a ruptured steam generator.
Recommendation #2 (GL-2): At Calvert Cliffs, the alternate AW system water supplies connect to the AW system pu=p suction piping downstream of the primary source isolation valve. The recuirement for redundant valving will be addressed as part of our long-tem comitment to add a third pump train.
(See the discussicn following GL-3 below for more details).
Recommendation #3 (GL-3): It is our intent to change the cxisting AW system steam supply MOV's to air operated fail open valves by January 1,1981 or as soon as practicable thereafter. This change will be included as part of our long-tem commitment to add a third pump train.
d204287 Reccx::menaations #4 and #5 along with the concern expressed about the coc: mon location of the AWS pumps and associated equipment has resulted in our cer-mitment to add a third pump train to the Calvert Cliffs AW system. A preliminary design is under review. The new system will be seismic Class I & will include new diesel or electric pumps housed in a new building.
Pu=p discharge piping will tie into the auxiliary feedwater headers down-stream of the existing aux feed regulating valves. The auxiliary shutdown panels will be moved out to the new building.
We feel that the addition of a third pump train is the best way to eliminate concerns regarding the reliability of the aux feed system at Calvert Cliffs.
With this approach outage related construction time is minimized, concern about common headers is eliminated, instrumentation is relocated to an area removed frem a possible steam environment, diversity in pump motive power is obtained, and overall system reliability is greatl; enhanced. The new system will be automatically initiated with a manual start back-up. The new systen in combir.ation with the existing system will provide superior protection against single failures including pipe breaks & operator induced failures.
Although we feel that the AW system at Calvert Cliffs is reliable as-is, we do recognize the concerns expressed by the IGC as valid.
We recognize that events at TMI-2 clearly demonstrated the importance of AW systems, and we are committed to making changes to enhance the reliability of our system. This work will be given the high priority it deserves. You will be infomed as schedule milestones are established during the project design phase, but it must be noted at the outset that such an extensive project can not be completed within a year.
Based on best infomation currently available, the. design and engineering phase of this project will require one year's time. We trust you will find our response to the concerns you have expressed as satisfactory, and we look forward to a period of cooperation in the best intcrests of all concerned.
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r A. E. Lundvall, Jr.
Vice-Predident - Supply ec - Messrs:
J. A. Biddison, Esquire G. F. Trowbridge, Esquire E. L. Conner - IEC P. W. Kruse - CE J. W. Bro"
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