ML20041A360

Tech Specs for Redundant Decay Heat Removal Capability, Millstone Nuclear Power Station,Unit 2, Revised Page

ML20041A360
Person / Time
Site:	Millstone
Issue date:	02/16/1982
From:	EG&G, INC.
To:	Office of Nuclear Reactor Regulation
References
CON-FIN-A-6429 EGG-EA-5481-ERR, EGG-EA-5481-R02, EGG-EA-5481-R2, NUDOCS 8202220031
Download: ML20041A360 (2)

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ABSTRACT e sg;1 9

(4 g This report reviews the Millstone Unit No. 2 Technical Soecification ,

requirements for redundancy in decay heat removal capability in all modes of operation.

FOREWORD This report is supplied as part cf the " Selected Operating Reactor Issues Program (III)" being conducted for the U.S. Nuclear Regulatory Commission, Office of Nuclear Reactor Regulation, Division of Licensing, by EG&G Idaho, Inc., Reliability and Statistics Branch.

The U.S. Nuclear Regulatory Commission funded the work under the

! authorization, B&R 20 19 01 06, FIN No. A6429.

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Hot Standby (made 3) 3.4.1.2 Limiting Conditions. for Operation 4.4.1.2.1 Surveillance Requirement 4.4.1.2.2 Surveillance Requirement Shutdown (modes 4 & 5) 3.4.1.3 Limiting Conditions for Operation 4.4.1.3.1 Surveillance Requirement X 4.4.1.3.2 Surveillance Requirement 4.4.1.3.3 Surveillance Requirement 4.4.1.3.4 Surveillance Requirement Refueling Operations (mode 6) 3.9.8.1 Limiting Condition for Operation 3.9.8.2 Limiting Condition for Operation 4.9.8.1 Surveillance Requirement 4.9.8.2 Surveillance Requirement 3.0 DISCUSSION AND EVALUATION Millstone Unit No. 2, is a two loop Combustion Engineering (CE) PWR plant. The following discussion presents an evaluation of the proposed technical specifications submitted by Northeast Utilities for redundant decay heat removal as requested by the NRC.

3.1 Startup and Power Operation--Modes 1 and 2 The proposed TS require that both reactor coolant loops and coolant pumps are to be operational. If these conditions are not met, the reactor is to be in Hot Standby (Mode 3) within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The proposed TS require verification that the required reactor coolant loops are in operation at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

The above described proposed TS are in agreement with the MTS since two coolant loops are required and the periodic surveillance assures the operability of the systems.

3.2 Hot Standby--Mode 3 The proposed TS require two coolant loops and at least one associated coolant pump for each loop shall be operable and at least one of the coolant loops shall be in operation during this operating mode;a and the proposed TS require the plant to be in Hot Shutdown (Mode 4 & 5) in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> if the two coolant loops are not operable and cannot be restored to operable status

a. All reactor coolant pumps may be de-energized for up to I hour provided (1) no operations are permitted that would cause dilution of the reactor coolant system baron concentration, and (2) core outlet temperature is maintained at least 10 0F below saturation temperature.

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