ML20237H629

Rev 0 to Function Restoration Guidelines FR-H.2, Response to Steam Generator Overpressure

ML20237H629
Person / Time
Site:	Sequoyah
Issue date:	08/21/1985
From:	Patterson B, Strickland G TENNESSEE VALLEY AUTHORITY
To:
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References
FR-H.2, NUDOCS 8708170296
Download: ML20237H629 (5)

Text

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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR FLANT ,

FUNCTION RESTORATION GUIDELINES -

FR-H.2 RESPONSE TO STEAM GENERATOR OVERPRESSURE -

t Revision 0 l

PREPARED BY: G. Strickland RESPONSIBLE SECTION: Of;erations /7 REVISED BY:

SUBMITTED BY: //NY be '

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• ResI'fofisiblp S' e'cpion Supervisor AUG 2y1985 PORC PEVIEW DATE:

APPROVED BY: %cd . t (o~

Plant Manager DATE APPROVED: 'AUB 211985 Reason for revision (include all Instruction Change Form Nos.):

New Instruction written per commitment to NUREG 0737.

The last page of this instruction is number: 3 8708170296 87081137 PDR ADG0K 050 P

d SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG FUNCTION RESTORATION GUIDELINES FR-H.2 PEVISION Date -

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

~New instruction written per commitment 0 A!JG 211985 All to NUREG 0737

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SQNP

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

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RESPONSE TO STEAM GENERATOR OVERPRESSURE A. PURPOSE This guideline provides actions to respond to a steam generator pressure above the highest safety valve setpoint.

B. SYMPTOMS S/G press great r than 1117 psig C. TRANSITION FROM OTHER INSTRUCTIONS Status Tree

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• SQNP FR-H.2 Unit 1 or 2 Page 2 of 3 Rev. 0 1

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RESPONSE TO STEAM GENERATOR OVERPRESSURE STEP __ ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

1 Identify Affected S/G

a. S/G press > 1117 psig a. IF ull S/G press

< 111.7 psig, T_lfM return to instruction in effect 2 Verify MFW Isolation To Affected S/G

a. MFW isolation valve - CLOSED

b. MFW reg valve - CLOSED

c. MFW bypass valve - CLOSED 3 Verify AFW Isolation To Affected S/G

a. Motor-driven AFW 1evel control valve - CLOSED

b. Turbine-driven AFW level control valve - CLOSED

c. Affected S/G AFW flow 0 gpm l

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SQNP FR-H.2 Unit 1 or 2 Page 3 of 3 Rev. O lI( RESPONSE TO STEAM GENERATOR OVERPRESSURE STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4 Depressurize Affected S/G

a. IF water is NOT in main a. IF water is in main steamline (< 90% S/G narrow steamline (> 90% S/G range level), narrow range level),

THEN depressurize S/G THEN do NOT from one of the following: depressurize affected 1

S/G. Refer to

• FR-H.3,

1) S/G PORV RESPONSE TO STEAM GENERATOR HIGH LEVEL

2) MSIV bypass valve

3) Steam supply to turbine driven AFW pump 5 Restore Normal S/G Operation

,, / ar Affected S/G press s equal to intact S/G press h

b. Control AFW flow to maintain S/G narrow range levels between 25% and 50%

6 Check T-Hot < 550 F l

a. Cooldown RCS < 550 F a. E condenser steam using condenser dumps dumps NOT available, THEN use intact S/G PORVs 7 Return To Instruction In Effect

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