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 ResI'fofisiblp ' e'cpion Supervisor S

.e 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 870811 PDR ADG0K 050 37 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

(

f' I.L l

0262L/mbs i

1 I

j

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

e m

1 l l

1 L-J

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

RESPONSE TO STEAM GENERATOR OVERPRESSURE

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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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