ML20042F189
| ML20042F189 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 04/26/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20042F187 | List: |
| References | |
| NUDOCS 9005070359 | |
| Download: ML20042F189 (3) | |
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UNITED STATES g
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NUCLEAR REGULATORY COMMISSION 9 E WASHINoTON, D. C. 20555 k....+,
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGU'.ATION RELATED TO AMENDMENT NO. 53 TO FACILITY OPERATING LICENSE NO. NPF-30 UNION ELECTRIC COMPANY EALTXWAY PLANT, UNIT 1-DOCKET NO. STH-50-483 i
1.0: INTRODUCTION By letter dated November 14, 1989,.the Union Electric Company (the licensee) requested changes to Technical Specification (TS) 3/4.7.1'.2 for the Callaway Plant. The proposed changes add clarification to Surveillance Requirements 4.7.1.2.1.a(4) and 4.7.1.2.1.b(1) by identifying automatic valves that are i
either excluded or-included in the flow path of the Auxiliary Feedwater' -
1 (AFW) System whose position has to be verified to demonstrate operability.
1 2.0- DISCUSSION
-The AFW system provides a reliable source of water to the steam. generators for decay heat removal. The system consists of two motor-driven pumps, one steam' turbine-driven pump, and associated piping, valves, instruments, and controls.. Normal flow is from the condensate storage tank (CST) to AFW pumps and, if a low suction pressure condition exists, these pumps are 1
automatically aligned to Essential Service Water System (ESW) as a backup source of water. Surveillance Requirement 4~.7.1.2.1.a(4) provides verification once every 31' days that each automatic valve in the in the normal flowpath l
of the AFW system is in the fully open position whenever the AFW' system is
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placed in automatic' control or when the plant is above 10% rated thermal power. The proposed change adds clarification to_this' requirement by identifying that valves Al-HV-30, 31, 32 and 33, which are used.only for alignment of AFW pumps to the back-up source (ESW), are not part of the normal flow 4.7.1.2.1.a(path and'therefore are not subjected to requirements of4). These valvas upon receipt of low suction pressure.
Surveillance requirement 4.7.1.2.1.b(1) is a demonstration of operability to be performed once every 18 months to verify that the suction supply switches from the normal CST supply to the backup (ESW) source upon receipt of an AFW suction Pressure-Low test signal. The proposed change adds clarification by. identifying that AFW valves AL-HV-30, 31, 32 and 33 are subjected to this operability requirement because these valves must open to connect AFW pumps to the back-up source upon low pressure in the normal-source line.
1 9005070359 900426 PDR ADOCK 05000483
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3.0 EVALUATIOW L
.i The prop (osed changes described above identify AFW valves, AL-HV-30, 31, 32, L
and 33 AFW/ESW valves), as not part of the normal AFW system flowpath and l
whose: position is not required to be verified open for AFW system operability. The staff has determined that clarification to Surveillance Requirement 4.7.1.2.1.a(4) by specifying the exclusion of the ASW/ESW l-valves stated above does not change the intent of the surveillance l
requirement and is therefore acceptable.
I Successful-completionofSurveillanceRequirement4.7.1.2.1.b(l')provides adequate assurance that, if-a low pressure condition existed at the AFW l.
pump suction, the back-up supply of water from the ESW system would be -
c supplied to the AFW pumps via the AFW/ESW valves described above. The l
staff has determined that the clarification provided by the proposed TS change does not change the intent of the original surveillance requirement l
and is'therefore acceptable.
Both proposed TS changes pro. vide specific identification of whether or not certain AFW valves are subject to the surveillance requirements.
In its' review'of the proposed TS change, the staff has' determined that the proposed changes will indeed provide clarification without changinp the intent of the original surveillance requirements.. AFW valves Al-HV-34, 35 and 36.close upon the AFW low suction pressure condition and they are verified to close in-the actual surveillance-procedure.
Failure of these-i valves to close in the event a break in the CST supply pip _ing occurs would not prevent ESW flow to the AFW pumps due to.the presence of a check valve in the CST supply piping. Also, AFW valves AL-HV-30, 31, 32 and 33 need not be verified every 31 days in Surveillance-Requirement 4.7.1.2.1.a(4) because -(1) leakage from the ESW system to the CST would be detected during normal chemistry surveillance, (2) these valves are normally closed, and (3) these valves are verified operable every 18 months in Surveillance Requirement 4.7.1.2.1.b(1).
Additionally, no changes to setpoints, system configuration or operation of the AFW system are involved with this proposed amendment. The staff has reviewed the proposed TS change and finds that the clarification provided by the change is acceptable, c
4.0 ENVIRONMENTAL CONSIDERATION
This amendment involves a change to a requirement with respect to the instal-lation or use of a facility component-located within the -restricted area as defined in 10 CFR Part 20 or a change to a surveillance requirement. The staff has determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite and tnat there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that this amendment involves no significant. hazards consideration and there has been no public comment'on such finding.. Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forthin10~CFR51.22(c)(9).
Pursuantto10CFR51.22(b),noenvironmental impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
5.0 C,0f!!LUS10N The staff h&s concluded, based on the considerations discussed above, that:
(1)-there is reasonable assurance that the health and safety of the will not be endangered by operation in the proposed manner; and (2) public such activities will.be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
6.0 ACKNOWLEDGEMENT Principal Contributor:
S. V. Athavale A. T. Gody, Jr.
Dated: April 26, 1990 t
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