NLS9000157, Proposed Tech Spec Bases Section 3.12.C, Svc Water Sys. Diagrams of Previous & Current Svc Water Sys Configurations Encl

Proposed Tech Spec Bases Section 3.12.C, Svc Water Sys. Diagrams of Previous & Current Svc Water Sys Configurations Encl

ML20042F742
Person / Time
Site:	Cooper
Issue date:	05/03/1990
From:	NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20042F738	List: ML20042F737 NLS9000157, Proposed Tech Spec Bases Section 3.12.C, Svc Water Sys. Diagrams of Previous & Current Svc Water Sys Configurations Encl
References
NLS9000157, NUDOCS 9005090330
Download: ML20042F742 (3)

Text

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heat exchanger. Valves are included in the common discharge header to permit the Seismic Class I service water system to be operated as two independent loops. The heat exchangers are valved such that they can be individually backwashed without interrupting system operation.

l During normal operatiun two or three pumps will be required. Three pumps are used for a normal shutdown.

The loss of all a-c power will trip all operating service water pumps.

The automatic emergency diesel generator start syntem and emergency equipment starting-sequence will then start one selected service water pump in 30-40 seconds.

h th: :::: ' r, the/dYo da service water-

-lresultingl header pressure will e4eee the turbine building 4 ;; 22 :: 10:12:10 header,.and i

M oe. guaranteeing supply to the reactor building, the control room split the basement, and the diesel Lenerators from the one service water pump.

Service Wa-linitiate isolation of I ter loops, Due to.the redundance of pumps and the requirement of only one to meet the accident requirements, the 30 day repair time is justified.

D.

Batterv Room Ventilation The temperature rise and hydrogen buildup in the battery rooms without adequate ventilation is such that continuous safe operation of equipment in these rooms cannot be assured.

4.12 BASES

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Main Control Room Ventilation System

' Pressure drop across the combined HEPA filters and charcoal adsorbers of less 4

than 6 inches of water at the system design flow rate will indicate that the filters and adsorbers are not clogged by excessive amounts of 7

i foreign matter. Pressure drop should be determined at least once per operating cycle to show system performance capability.

Tests of the charcoal adsorbers with halogensted hydrocarbon refrigerant should be performed in accordance with ANSI N510-1980.

l The frequency of tests and sample analysis are necessary to show that the HEPA filters and charcoal adsorbers enn perform as evaluated. The test cannisters that are installed with the adsorber trays should be used for the charcoal adsorber efficiency test.

Each sample-should be at least two inches in diameter and a length' equal to the thickness of the bed.

It test results are unacceptable, all adsorbent in the system shall be replaced with an adsorbent qualified according to Table 1 of Regulatory Guide 1.52.

The replacement tray for the absorber tray removed for the test should meet the same adsorbent quality. Tests of the HEPA filters with DOP aerosol shall be performed in accordance to ANSI N510-1980. Any HEPA filters found l

defective shall be replaced with filters qualified pursuant to Regulatory Position C.3.d of Regulatory Guide 1.52.

Operation of the system for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> uvery month will demonstrate operability of the filters and adsorber system and remove excessive moisture

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