ML20096B098
| ML20096B098 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/21/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| OL, NUDOCS 8408310413 | |
| Download: ML20096B098 (4) | |
Text
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RELATED CORIN.Op_%$
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PHILADELPHIA ELECTRIC COMPANY-
'l 2301 MARKET STREET 3
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P.O. BOX 8699 PHILADELPHIA. PA.1910tTE0
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estGC JOHN S. KC6 PER
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84 ISO 24 N0116 ugust 21, 1984
.a Mr.'A. Schwencer, Chief
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Licensing Branch No. 2 u" A '
Division of Licensing U.S. Nuclear Regulatory Conmission Washington, DC 20555 Subject!:
Limerick Generating Station Response to Procedures and Systems Review Branch (PSRB) Questions
References:
D. R. Helwig (PECo) telecon with E. Tomlinson (NRC) on August 10, 1984
Dear Mr. Schwencer:
Our response to PSRB question 430,72 regarding diesel oli storage tank vent ilnes is hereby revised to include additional information discussed in the referenced telecon..
1 Very truly yours, i dd [
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J. S. Kenper ORM/cmv/0'7258406,-
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Attacivnent S
Copy to:
See Attached Service List N
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cc: Judge Lawrence.Brenner.-
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Judge Richard F. Cole (w/ enclosure)
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8 DRAET LGS FSAR DUESTION.430.72 (Section 9.5.4) 4 Describe your design provisions made to protect the fuel oil storage tank fill and vent lines from damage by tornado missiles.
5 i
RESPONSEW 3
A single above ground fill connection to the fuel oil storage
,t,anks is provided to supply each tank through an underground
-common header, as shown in Figure 9.5-8, Sheet 1.
Each tank is sequipped with a separate above ground vent line.
Both the fill
, connection and the vent lines extend only a minimal distance above the ground.
- missiles, In the unlikely' event of damage by tornado
'to allow continued opera, tion of the diesel generators:the following A^ Mrnate paths for filling and venting each tank are a.
available (e.g., manhole of'the tank) s je gt b.
-Th ven linerfo ach/tapk s backe up/Sy a p
at'v cu
- a rudel r
'ef va'Ive/ w i i
loca d
ith n the ta y lve pi p edened o i
vafve 11 s
ont/nue pe ati n te feloit/anfyr yv t gf bl i
a in th ve t' lin_.
Thc V Ivu pd 11sc. vem,.cd 4.v -the,-atmosp e_ 7. I f ERT-Cross connections are provided in the fuel oil supply and c.
return lines to each diesel to alioe any diesel to be supplied!from any storage tank.
As an example, if the storage tank "A" fill or vent lines were damaged so as to make the tank unavailable, and diesel generator "B" was not available, the following manual operator actions would.be taken (Figure 9.5-8):
valves 1045B and 1101A would be closed and valves 1080A, 1080B, 1100A and 1100B would be opened.
The "B" transfer pump would be started and would pump to the "A" day tank.
When the "A" day tank is full, the full flow overflow line would return the diesel oil to the "B" storage tank.
As noted in Section 9.5.4.2, the day tank holds sufficient fuel for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of continuous diesel generator operation at full load; sufficient fuel oil for approximately one hour of full load operation remains at the point where-the low level e.larm annunciates.
Therefore, credible tornado missile damage to the fill line or a vent line would not affect the safe shutdown of the plant.
1 430.72-1 Rev. 21, 06/83
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