ML20094P541

Rev 23 to Procedure 5.4.6, Primary Containment Venting & Purging Under Emergency Conditions, Revising Coversheet & Attachment 1,Sheet 3 of 5,page 8 of 20

ML20094P541
Person / Time
Site:	Pilgrim
Issue date:	03/19/1992
From:	Smith P BOSTON EDISON CO.
To:
Shared Package
ML20094P531	List: ML20094P528 ML20094P541
References
5.4.6, NUDOCS 9204080202
Download: ML20094P541 (2)

Text

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1 BOSTON EUISON RTYPE H6.05 I

PILGRIM NUCLEAR POWER STATION Procedure No. 5.4.6 I

l PRIMARY CONTAINMENT VENTING AND PURGING UNDER EMERGENCY CONDITIONS l

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1 REVIEWEjS AND APPR0'fERS 1 y Wf

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'Piant Manaaer Date Effective Date:

S-20-99 5.4.6 Rev. 23 9204080202 920330 DR ADOCK 0500 3

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ATTACHMENT 1 s..e t -

Sheet 3 of 5 (2) Containment Atmosphere Dilution-System Torus Isolation valves

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(C170 and C171) Special' Key CR-V.

• SV-5083A.' TORUS ISOLATION VALVE

• - SV-5084A,. TORUS ISOLATION VALVE

• SV-5083B, TORUS ISOLATION VALVE i

• SV-5084B. TORUS ISOLATION VALVE

....o..........................................................................

CAUTION

>m performing the following, refer to Emergency Classifications 1.

'-100.. Reference EAL 3.4.1.4, EAL 3.5.1.4, and EAL 3.5.2.4.

w-5 01, additional venting capacity is required,

&MD primary containment pressu.re is 1 30 psig, IBER VENT the Torus, bypassing SGTS as follows:

4-(1) CLOSE 08 VERIFY CLOSED the following valves:

• A0-5042A, T0HUS PURGE EXHAUST ISOL VLV e A0-5041A, T0kv5 NORMAL EXHAUST ISOL VLV

• AO-5041B, TORUS NORMAL EXHAUST ISOL VLV

• SV-5083A, TORUS ISOLATION VALVE e SV-5084A, TORUS ISOLATION VALVE

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• SV-5083B, TORUS ISOLATION VALVE

• SV-50848, TORUS ISOLATION VALVE (2) PLACE the-fan control' switches for SGTS Exhaust Fans VEX-210A L

AMQ VEX-210B to "0FF".

P (3) CLOSE QR VERIFY CLOSED the following valves:

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• A0-N-112 TRAIN B OUTL DHPR

• AD-N-108, TRAIN A 00TL OMPR L

(4) OPEN AD-50428, TORUS. PURGE EXHAUST ISOL VLV, bypassing isolation interlocks according to PNPS 5.3.21, " Bypassing Selected Interlocks" Attachment 12.

5.4.6 Rev. 23 Page 8 of 20

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