ML20237H659

Rev 1 to Function Restoration Guidelines FR-P.1, Response to Pts

ML20237H659
Person / Time
Site:	Sequoyah
Issue date:	04/27/1987
From:	Strickland G, Terpstra G, Jacqwan Walker TENNESSEE VALLEY AUTHORITY
To:
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References
FR-P.1, NUDOCS 8708170303
Download: ML20237H659 (13)

Text

-

4 TENNESSEE VALLEY. AUTHORITY F

I SEQUOYAH NUCLEAR PLANT-1 FUNCTION RESTORATION GUIDELINES FR-P.1 RESPONSE TO PRESSURIZED THERMAL SHOCK s

Revision 1 PREPARED BY:

G. Stri.ckland l

r RESPONSIBLE SECTION:

Operations REVISED BY:

Gary L. Terpstra SUBMITTED BY:,

,jl

,-r

~

sp'onsible Se'ction Supervisor PORC REVIEW DATd:

.APR 2 71987 APPROVED BY:

l Plant Manager DATE APPROVED:

I?[i 2 7 7007 Reason for revision (soclude all Instruction Change Form Nos.):

Revised Step 13 to_ correct typographical error; also, graph l

(pg. 11).

Revised due to report LO2 861002 897 to provide better presentation (human factors) of graphs.

~The last page of this instruction is number:

11 1

8708170303 j7[PDRh7 PDR ADOCK l.

P l

a SEQUOYAH NUCLEAR PLANT l(F PLANT INSTRUCTION REVISION LOG FUNCTION RESTORATION GUIDELINES FR-P.1 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS)

New instruction written per commitment 0

08/21/85 All to NUREG 0737 Revised Step 13 to correct typographical error; also graph (pg. 11).

Revised due i

to report LO2 861002 897 to provide better presentation (human factors) of APR f2 71987 1

7,11 oranns.

4(

~

k s

0267L/ tac

SQNP

+

FR-P.1 Unit 1 or 2 Page 1 of 10 Rev. O RESPONSE TO PRESSURIZED THERMAL SHOCK

^

A.

PURPOSE This guideline provides actions to respond to pressurized thermal shock or overpressure conditions at low temperature.

B.

SYMPTOMS s

Refer to Status Tree C.

TRANSITION FROM OTHER INSTRUCTIONS Status Tree

, r#

• W l

a~

. l l

l l

J t

SQNF FR-P.1 Unit 1 or 2 Page 2 of 10 Rev. O RESPONSE TO PRESSURIZED THERMAL SHOCK

~

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

Check T-Cold IF T-cold decreasing in an uncontrolled manner, a.

T-cold - STABLE AND THEN verify steam dumps CONTROL, LED AND S/G PORVs closed IF uncontrolled cooldown Entinues,

THEN close MSIVs AND MSIV bypass valves 2

Check S/G Press IF S/G press low and decreasing in an a.

Press in all S/Gs within uncontrolled manner, 100 psi of each other THEN isolate faulted S/G:

e b.

All S/G press -

l STABLE OR INCREASING Isolate AFW and main FW Close MSIV and bypass valve

\\

Align turbine-driven AFW steam to intact S/G IF all 4 S/Gs faulted, THEN redure AFW flow to 25 gpm to each S/G AND do NOT implement FR-II.1 i

3 Minimize RCS Cooldown j

a.

Control AFW and S/G press as required b.

Control RHR if in service

SQNP FR-P.1 Unit 1 or 2 Page 3 of 10 Rev. O

~

RESPONSE TO PRESSURIZED THERMAL SHOCK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4

Check Pzr PORVs IF RCS press below cold overpress limit AND below a.

IF_ RCS press > cold 2335 psig, overpress limit, THEN ensure pzr PORV THEN verify pzr PORV or block valv3 closed I

and block valve open b.

IF RCS press > 2335 psig, THEN verify pzr PORV and i

block valve open 5

Check ii SI Can Be Terminated E SI previously terminated, THEN continue with step 9 a.

hCS subcooling > 100 F E SI termination criteria

{(

can JOT be satisfied, THEN:

se N Do not terminate SI IF no RCP running, THEN attempt to start one RCP.

Reference SOI-68.2 if necessary Go to step 20 e~ - _ _ _ _ _ _ _ _ __

I SQNP FR-P.1 Unit 1 or 2 Page 4 of 10 Rev. O RESPONSE TO PRESSUR17ED THERMAL SHOCK

~

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 6

Reset SI Check P-4 interlock with SI reset, SI-268 7

Reset Phase A And Phase B 8

Stop ECCS Pumps And Place In Standby a.

RHR Pumps b.

SI Pumps c.

All but one CCP

[

9 Verify ECCS Not Required IF RCS subcooling

,L can NOT be satisfied,

~~

a.

RCS subcooling > 40 F THEN:

i Start CCP and/or SI Pumps as necessary IF no RCP running, THEN attempt to start one RCP.

Refer to SOI-68.?

if necessary Go to step 20 4

j I

l l

SQNP i

l FR-P.1 Unit 1 or 2 l

Page 5 of 10 l

Rev. O l

I i

RESPONSE TO PRESSI'RIZED THERMAL SHOCK 1

s 1

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

i l

I 10 Stabilize T-hot a.

Increase AFW flow as necessary to stabilize T-hot b.

IF condenser steam dumps or S/G PORVs available, THEN control systems as necessary 11 Isolate All Accumulators a.

Ensure UHI isolation valves closed and gagged "g(

b, Restore power to cold leg accumulator isolation valves c.

Close cold leg accumulator c.

E isolation valve isolation valves can NOT be closed, THEN vent any unisolated accumulator

~-

SQNP FR-P.1 Unit 1 or 2 Page 6 of 10 Rev. 0 r

(

i RESPONSE TO PRESSURIZED THERMAL SHOCK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 12 Depressurize RCS a.

Depressurize RCS ucing a.

IF normal sprays NOT normal pzr sprays available,

THEN use one pzr PORV and note following:

1) Upper head may void during depressurization

2) Minimize cycling PORV

3) PRT may rupture IF both normal sprays

(

AND PORVs not available, THEN use aux spray b.

Stop depressurization b.

IF RCS depressurization when one of the following can NOT be stopped, conditions met:

THEN consider following actions:

RCS subcooling < 40 F Stop RCP associated OR with failed spray valve Pzr level > 20%

Close pzr PORV block

[50% FOR ADVERSE valve CNTMTJ i

Isolate aux spray by

[

closing FCV-62-90 and 91 Start CCP and/ar.

SI Pumps to restore subcooling l

1 L_

SQNP FR-P.1 Unit 1 or 2 Page 7 of 10 Revision 1 RESPONSE TO PRESSURIZED THERMAL SHOCK i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION: An increase in RCS press may result in excessive reactor vessel stress.

RCS press and temp should be maintained stable while performing subsequent s teps.

l 13 Check Pzr Level a.

Level > 20% [50% FOR a.

IF pzr level < 20%

l ADVERSE CNTMT]

T50% FOR ADVERSE CNTMT],

THEN attempt to restore level with CCP while maintaining stable RCS press IF pzr level can ITOT be established, THEN go to step 20 14 Establish Normal Charging a.

Close FCV-62-89 b.

Open charging line isolation FCV-62-90 and 91 c.

Open FCV-62-85 or 86 d.

Adjust FCV-62-89 and 93 as required e.

Open seal water return FCV-62-61 and 63 L

RESPS/Q aac

SQNP FR-P.1 Unit 1 or 2 Page 8 of 10 Rev. O I

RESPONSE TO PRESSURIZED THERMAL SHOCK

~

i i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Establish Letdown IF letdown can NOT be established,

a.

Open letdown isolation THEN_ estaolish excess.

valves :

letdown 4

1) FCV-62-69 e

2) FCV-62-70

3) FCV-62-77 b.

Adjust letdown press controucr, FCV-62-81,

~ 25% open in manual c.

Open an orifice valve C

d.

Adjust FCV-62-81 for desired press, then

~,

place in AUTO

1) 320 psig at normal letdown temp 16 Isolate BIT a.

Close BIT inlet FCV-63-39 and 40 b.

Close BIT outlet i

FCV-63-25 and 26

{

1 1

4 l

l 1

, L__ _ _

SQNP FR-P.1 Unit 1 or 2 Page 9 of 10 Rev. 0

. RESPONSE TO PRESSURI7ED THERMAL SHOCK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 17 Alig;n CCP Suction To VCT a.

Open VCT outlet valves FCV-62-132 and 133 s

b.

Close RWST valves FCV-62-135 and 136 18 Check VCT Makeup System a.

Makeup set for RCS boron concentration 19 Control RCS Press

('

a.

Maintain RCS subcooling between 40 F and 60 F b.

Control pzr heaters as necessary c.

Control pzr normal sprays c.

E nonnal pzr sprays as necessary NOT available, THEN use aux spray E aux spray NOT available, THEN pse one pzr PORV Y

O i

)

SQNP FR-P.1 ' Unit 1 or 2 Page 10 of 10 Rev. O RESPONSE TO PRESSURIZED TIIERMAL SHOCK STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 20 Determine If Additional Cooldown Restrictions Required a.

IF any T-cold cooldown a.

IF all T-cold cooldown exceeded 100 F in any less than 100 F in any 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, I hour, TIIEN_:

THEN no additional cooldown restrictions

1) Do not cool down RCS

^

required. Maintain RCS until temp has been temp and pr. ss within stable for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> normal cooldown curve

~'

2) Do not increase RCS press during that time

3) Perform actions of other instructions in effect which do not cool down or increase

'~

RCS press until the RCS temp soak has been completed

4) RCS cocidown is permitted after 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />

5) Maintain RCS press and temp within limits of Figure 1

6) Maintain all T-cold cooldown less than 50 F in any 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 21 Return To Instruction In Effect

- FND -

SQNP F R-P.1 Unit 1 or 2 Mgure 1

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/ _ - _ _ - _. _ _.