ML20213E408
| ML20213E408 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 04/13/1983 |
| From: | Houston R Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0262, CON-WNP-262, RTR-NUREG-0892, RTR-NUREG-892 NUDOCS 8304200584 | |
| Download: ML20213E408 (3) | |
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S c. y;p APR 131983 EENOR/1:b' lit FCP: Tho :as :. t'cyak, tssistant Director for Licensing Division of Licensing Fh0;4:
P. !!ayne Hcuston, l.ssistant Pirector for Peactor Safety Division of Systa :s Intejration SURJECT:
t'f'P-2 SSEP I"PUT FrR FSAR SECTION 7 (If*STRUFEi!TATIN' /M CCt:TRCLS); ST.M'MY SERVICE '!ATEP SYSTEM NULTIPLEMRS PIant f! ale:
Lif'P-2 Docket i'o.:
50-397 Licensing Status:
OL Responsicle 9, ranch: LF2 Droject Msnager:
R. Auluck Revie.s
- ranch:
ICS4 Revie.4 Status: Calpleta for this item Enclosed is ICSi: incut for Section 7 (Instruaentation and Controls) of the wirP-2 Supplemental Safety Evaluation Report (S5dR).
This input addresses outstanding issue #10 (Standby Service Pater Systa'i Instrmen-tation and Control Design) as identifled in Sec. tion 1.7 of il!PEr. nega (Safety Evaluation Report related to the operation of PPSS !'uclear Project f'o. 2).
"e consider this iten to be resolvea.
07!$a21 Signed By
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R. !/ayne Pouston, f.ssistant Pirector for Peactor Safety Division of Systems Integration
Enclosure:
Distribution:
As stated Docket File ICSB R/F cc:
P. ?'attson R. Kendall (PF)
A. Schwencer AD/RS Rdg.
!! t.oluck F. Rosa R. Capra C. Rossi b [/>
J. Joyce 304200 0413 euucK 05000397 ep
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,APR 131983 S
7.2.3.4 Standby Service Water (SSW) System The Standby serviNe water (SSW) system was designed using multiplexed signals to operate associated pumps and valves.
The staff raised several concerns regarding the use of multiplexing in this Class 1E application.
Of particular concern were the potential effects of e l e c t r om a g n'e t i c interference (EMI) on the SSW multiple xer systems, and the inability to manually operate SSW system components remotely, independent of the multi-plexer systems.
The applicant has since proposed to" implement design modifications which remove all safety related functions from the multiplexers.
This will allow the SSW pumps and valves in the primary flow path to function without the multiplexer, and. manual initiation / control capability for SSW components from the control room independent of the multiplexers.
The multiplexers will remain opera-tional, providing the operator with supplementary infor-mation from the SSW pumphouse.
Examples are spray pond level and temperature, pump discharge pressures, and pump motor and bearing temperatures.
Sufficient instrumenta-tion independent of the multiplexers is provided in the control room to allow the operators to verify SSW system operability.
This instrumentation includes valve posi-tion and pump running status lights, SSW flow through the RHR heat exchangers, and low flow alarms for the IESIGIM ED ORIGIM L i
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components served ly the SSW system.
The applicant plans to complete these modifications prior to fuel Load.
The staff has determined, based on its review of the SSW system as described, and on supporting information provided in WPPSS letters G02-83-1'67 dated February 23, 1983, and G02-83-266 dated March 28,1983, t ha t the SSW system instrumentation and controls are acceptable.
The applicant wilL be required to submit the final drawings (electrical schematics) for the effected components when the design modifications are completed.
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