ML20237H659
| ML20237H659 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/27/1987 |
| From: | Strickland G, Terpstra G, Jacqwan Walker TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20237H133 | List:
|
| 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.):
l Revised Step 13 to_ correct typographical error; also, graph ,
(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 PDR ADOCK j7[PDRh7
- l. P l
- a SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG l(F .
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 1 APR f2 71987 7,11 oranns.
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+
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 W
, r#
- l a~
l l
l '
l t - - - - - _ - - - J
SQNF FR-P.1 Unit 1 or 2 Page 2 of 10 Rev. O
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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 -
STABLE OR INCREASING Isolate AFW and
, l .,
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 1
- 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
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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
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
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
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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
,L
~~
[ 9 Verify ECCS Not Required IF RCS subcooling 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 l
I l SQNP i l FR-P.1 Unit 1 or 2 l Page 5 of 10 l Rev. O l
I i
s RESPONSE TO PRESSI'RIZED THERMAL SHOCK 1 1 STEP ACTION / EXPECTED RESPONSE 1 RESPONSE NOT OBTAINED 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.
isolation valves E isolation valve 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
( ,,,
- b. Stop depressurization b.
IF both normal sprays AND PORVs not available, THEN use aux spray 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%
ADVERSE CNTMT] l 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 :
4 letdown e
- 1) FCV-62-69
- 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
- d. Adjust FCV-62-81 for
~, C , 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
- a. Open VCT outlet valves -
FCV-62-132 and 133 s
- a. Makeup set for RCS ,
boron concentration 19 Control RCS Press
,, (' a.
b.
Maintain RCS subcooling between 40 F and 60 F 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 Page 1 cf 1 {
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