ML19319C135

Submits Addl Info Re RCS Leakage Detection Provisions.Rcs Leakage Detection Sys Includes Containment Atmosphere Particulate & Gaseous Radioactivity Monitoring Sys & Containment Atmosphere Gaseous Radioactivity Monitoring Sys

ML19319C135
Person / Time
Site:	Davis Besse
Issue date:	01/26/1977
From:	Roe L TOLEDO EDISON CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
193, NUDOCS 8001310493
Download: ML19319C135 (3)

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Serial No. 193 40I pU Director of Nuclear Reactor Regulations g

w 27)g77,M Attention:

lir. John F. Stolz, Chief i

Light Water Reactor Branch No. 1

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Washington, D.C.

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Dear Mr. Stolz:

The following additional information is submitted with respect to provisions for detecting reactor coolant system leakage at the Davis-Besse Nuclear Power Station Unit 1.

The item was identified as outstanding review item (3) in the NRC's Safety Evaluation Report for Davis-Besse Unit 1.

The reactor coolant system leakage detection system includes the following:

a)

The containment atmosphere particulate radioactivity monitoring system.

b)

The containment sump level / flow monitoring system.

c)

The containment atmosphere gaseous radioactivity monitoring system.

Tae containment atmosphere particulate radioactivity monitoring system incorporates monitors which are seismic, redundant, with essential power supplies, and Q-listed.

The containment sump level and flow monitoring system design includes containment vessel normal sump totalized flow indication in the control room.

This is shown on FSAR Figure 9-9, and is c'

ignated FQI-2801.

The flow element is scismic and is not redundant Instrumentation and power supplies are not essential. The transmitter is mounted seismically.

There are redundant normal sump levels and alarms, as shown on FSAR Figure 6-17, with control room indication. They are non-essential, no n-s e ismic.

959 THE TCLECO ECrSCN CCMPANY ECISCN PLAZA 3CO MACISCN AVENUE TOLEOO. CHO 40652 i

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The contain=ent atmosphere gaseous radioactivity monitoring system utilizes monitors which are seismically qualified with essential power supplies. They are described in FSAR Section 12.1.4.

All systems used for reactor coolant system leakage detection can be calibrated during operation except the normal sump level.

In addition to the systems described abovt, a reactor coolant system water inventory balance will be conducted at least once per 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> during steady state operation in Mode 1.

This Surveillance Test ST5042.02 provides an accurar.e determination of RCS leakage.

Yours very truly, k

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