ML18153C884

Proposed TS Re Main Control Room & Emergency Switchgear Room Air Handling Units

ML18153C884
Person / Time
Site:	Surry
Issue date:	01/22/1992
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153C883	List: ML18153C882 ML18153C884
References
NUDOCS 9201280183
Download: ML18153C884 (3)

Text

ATTACHMENT 2 SURRY POWER STATION PROPOSED TECHNICAL SPECIFICATION CHANGE MAIN CONTROL ROOM AND EMERGENCY SWITCHGEAR ROOM AIR HANDLING UNITS

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9201280183 920122 PDR ADOCK 05000280 1I P PDR

• TS 3.23-2

b. If one chiller becomes inoperable, return the inoperable chiller to operable status within seven (7) days or bring both units to Hot Shutdown within the next six (6) hours and be in Cold Shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

2. Air Handling Units (AHU)

a. Unit 1 air handling units, 1-VS-AC-1, 1-VS-AC-2, 1-VS-AC-6, and 1-VS-AC-7, must be operable whenever Unit 1 is above Cold Shutdown.

1. If one* Unit 1 AHU becomes inoperable, return the in-operable AHU to operable status within seven (7) days or bring Unit 1 to Hot Shutdown within the next six (6) hours and be in Cold Shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. Unit 2 air handling units, 2-VS-AC-8, 2-VS-AC-9, 2-VS-AC-6, and 2-VS-AC-7 must be operable whenever Unit 2 is above Cold Shutdown.

1. If one* Unit 2 AHU becomes inoperable, return the in-operable AHU to operable status within seven (7) days or bring Unit 2 to Hot Shutdown within the next six (6) hours and be in Cold Shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

• The MCR and ESGR Air Conditioning System upgrade project includes the installation of two additional chillers. It is necessary to remove each train of chilled water from service for seven days to complete the installation of the chilled water connections for the additional chillers. The modifications will require planned entries into Action Statement 3.23.C. 2 with QM inoperable AHU in the MCR and QM inoperable AHU in the ESGR of each unit to complete. This modified action statement will only be used for the installation of the chilled water connections in the MRC and ESGR Air Conditioning System and will expire June 30, 1992."

Amendments

• TS 3.23-4 If the system is found to be inoperable, there is no immediate threat to the control room, and reactor operation may continue for a limited period of time while repairs are being made. If the system cannot be repaired within the specified time, procedures are initiated to establish conditions for which the filter system is not required.

The Main Control Room (MCR) and Emergency Switchgear Room (ESGR) Air Conditioning System cools the control room, the control room annex and the Units 1 and 2 emergency switchgear rooms. The air conditioning system includes three chillers (1-VS-E-4A, 48, and 4C) and eight air handling units (1-VS-AC-1, 2, 6, 7 and 2-VS-AC-6, 7, 8, and 9).

Interim modifications were completed on the MCR and ESGR Air Conditioning System to address interim failure and increased cooling requirements for the ESGRs. Permanent modifications will include replacement of the MCR and ESGR AHUs and installation of additional chiller capacity to restore original design flexibility.

Units 1 and 2 MCR and ESGR AHUs have been replaced in the initial phases of the permanent modification, restoring redundancy to the AHU portion of the original system design. As a result, the following MCR and ESGR equipment is required to operate to maintain design temperature under maximum heat load conditions:

• Two chillers

• One Unit 1 MCR AHU and one Unit 1 ESGR AHU

• One Unit 2 MCR AHU and one Unit 2 ESGR AHU In addition to the equipment restrictions above, a fire watch will be required during this interim period in both unit's ESGR and MER #3 to address Appendix R considerations.

Amendments