ML20128M547

Forwards Revised Pages IV & 215d to Proposed Change 18 of Tech Specs,Per Recent Telcon.Info Provides Bases for Main Control Room Ventilation Sys,Reactor Bldg Closed Cooling Water Sys & Svc Water Sys

ML20128M547
Person / Time
Site:	Cooper
Issue date:	05/24/1985
From:	Pilant J NEBRASKA PUBLIC POWER DISTRICT
To:	Vassallo D Office of Nuclear Reactor Regulation
References
NUDOCS 8506030004
Download: ML20128M547 (3)

Text

,e GENERAL OFFICE Nebraska Public Power District

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May 24,1985 Office of Nuclear Reactor Regulation Operating Reactors Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Mr. Domenic B. Vassallo, Chief

Subject:

Proposed Change No.18 to Technical Specifications Cooper Nuclear Station NRC Docket No. 50-298, DPR-46 In resporme to recent telephone discussions with the Staff, Nebraska Public Power District herein submits revised pages iv and 215d for the subject Proposed Change No.18 to the CNS Technical Specifications.

Should you have any questions or require additional information, please contact me.

Sincerely, E

..' Pilant Technical Staff Manager Nuclear Power Group JMP/Irb:cmz28/1 0tA k

0506030004OSOS2g9g ADOCK0500hDR PDR P

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Main Control Room Ventilation System The control room ventilation system is designed to filter the control room atmosphere for intake air and/or for recirculation during control room j

. isolation conditions. The system is designed to automatically <starto T

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upon control room isolation and to maintain the control room pressure to the design positive pressure so that all leakage should be out leakage.

High efficiency. particulate absolute'(HEPA) filters are installed before the

charcoal adsorbers to prevent clogging'of the iodine adsorbers. The charcoal adsorbe'rs are installed to reduce the potential intake of radioiodine to the, control room. The in-place-test results should-indicate a system leak-tightness of less than 1 percent bypass leakage for the charcoal adsorbers and HEPA' filters. The laboratory carbon sample test results should indicate l

a radioactive methyl iodide removal efficiency of at least 99 percent for expected accident conditions.- If the performance of the HEPA filters and

-charcoal adsorbers are as specified, the resulting doses will be less than the allowable levels stated in Criterion 19 of the General Design Criteria for Nuclear Power Plants, Appendix A to 10 CFR Part 50.

-l If the system is found to be inoperable, there is no immediate threat to i

the control room and reactor operation or refueling operation may continue for a-limited period of time while repairs are being made.- If the system

- cannot be repaired within seven days, the reactor is shutdown and brought j

to cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or refueling operations are terminated.

'l B.-

Reactor Building Closed Cooling Water System The reac' tor building closed cooling water system has two pumps and one heat exchanger in each of two loops. Each loop is capable of supplying the cooling requirements of the essential services following design l-accident conditions with only one pump in either loop.

The-system has additional flexibility provided by the capability of inter-connection of the two loops and the backup water supply to the critical p

loop by the service water system. This flexibility and the need for only one pump in one loop to meet the design accident requirements justifies l-the 30 day repair time during normal operation and the reduced requirements during head-off operations requiring the availability of LPCI or the core spray systems.

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Service Water System ll -

The service water _ system consists of four vertical service water pumps located in the intake structure, and associated strainers, piping, valving

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and instrumentation. The pumps discharge to a common header from which independent piping supplies two Seismic Class I cooling water loops and one

. i turbine building loop. Automatic valving is provided to shutoff all supply 4

to the turbine building loop on drop in header pressure thus assuring supply i

.to the Seismic Class I loops each of which feeds one diesel generator, two RHR

, service water booster pumps,.one control room basement fan call unit and one RBCCW

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