ML20237H649

Rev 0 to Function Restoration Guidelines FR-H.4, Response to Loss of Normal Steam Release Capabilities

ML20237H649
Person / Time
Site:	Sequoyah
Issue date:	08/21/1985
From:	Patterson B, Strickland G TENNESSEE VALLEY AUTHORITY
To:
Shared Package
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References
FR-H.4, NUDOCS 8708170301
Download: ML20237H649 (5)

Text

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TENNESSEE VALLEY-AUTHORITY C

SEQUOYAH NUCLEAR PLANT FUNCTION RESTORATION GUIDELINES FR-H.4 RESPONSE TO LOSS OF NORMAL STEAM RELEASE CAPABILITIES s

i Revision 0 PREPARED BY:

G.

Strickland

-RESPONSIBLESECTION:!Operationu

/

REVISED BY:

SUBMITTED BY:

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Responsibl6 Se tion' Supervisor.

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PORC REVIEW DATE:

APPROVED BY:

%d (A

Plaht' Manager DATE APPROVED:

Reason for revision (include all Instruction Change Form Nos.):

New Instruction written per commitment to NUREG 0737.

i The last page of this instruction is number:_

3 8708170301 B7ph7

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l SEQUOYAH NUCLEAR PLANT

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PLANT INSTRUCTION REVISION ~ LOG

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l FUNCTION RESTORATION GUIDELINES FR-H.4 REVISION _

Date Pages REASON FOR REVISION-(INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL'ICF FORM NUMBERS)

New instruction written per commitment

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'.AUG 211985 All to NUREG 0737 s

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0265L/mbs

SQNP FR-H. 4 Unit 1 or Page 1 of 3 Rev. O RESPONSE TO LOSS OF NORMAL STEAM RELEASE CAPABILITIES A.

PURPOSE This guideline provides actions to respond to a failure of the steam generator power operated relief valves and condenser dump valves B.

SYMPTOMS s

S/G press greater than 1064 psig l

C.

TRANSITION FROM OTHER INSTRUCTIONS

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l Status Tree O u

SQNP 4

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FR-H.4 Unit 1 or 2 Page 2 of 3 Rev. O

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RESPONSE TO LOSS OF NORMAL STEAM RELEASE CAPABILITIES

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

Identify Affected S/G a.

S/G press > 1064 psig a.

E al S/G press

< 1064 psig, THEN return to instruction in effect 2

Restore S/G PORV Control

~ Attempt to control S/G PORV from auxiliary a.

PORV handswitch not control room or locally in close b.

Adjust PORV controller c.

Air supply available f

d.

125-V DC available (k

.,e 3

Restore Condenser Dump Control a.

Air supply available b.

125-V DC available c.

At least one CCW Pump running d.

Condenser vacuum established e.

Dumps in press control mode f.

Steam dump interlock bypassed when T-avg

< 540 F g.

Adjust press controller h.

Check MSIVs open h.

IF MSIVs closed, THEN open MSIV bypass valves prior to opening MSIVs m

i SQNP FR-H.4 Unit 1 or 2 Page 3 of 3 Rev.O N.

RESPONSE TO LOSS OF NORMAL STEAM RELEASE CAPABILITIES STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

Depressurize Affected S/G a.

IF water is NOT iri a.

IF water is in main main steamline (< 90% S/G steamline (> 90% S/G narrow range level),

narrow range level),

THEN depressurize THEN refer to

• FR-H.3, affected S/G < 1064 psig RESPONSE TO STEAM using S/G PORV or GENERATOR HIGH condenser steam dump LEVEL 5

Return To Instruction In Ff.fect t(

A

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