ML20237H593
| ML20237H593 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/21/1985 |
| From: | Patterson B, Strickland G TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20237H133 | List:
|
| References | |
| FR-C.1, NUDOCS 8708170283 | |
| Download: ML20237H593 (13) | |
Text
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TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT
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4 FUNCTICd 'RESTORAI' ION GUIDELINES p.
i FR--C.' 1 '
RESPONSE TO IN'QEJUWTE CORE COOLING u
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J Revision 1 I
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PREPARED BY:
G. Strickland
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RESPONSIBLE SECTIOUt. 'derations n.
REVISED BY:
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DATE APPROVED:
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Reason for revision (include all Instruction Change Form Nos.):
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2 Revised to add reference to' status tree; delete indicator num-1, t/
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'bers; correct valve number.
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The last page of this instruction is number:
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%er SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG FUNCTION RESTORATION GUIDELINES FR-C.1 REVISION Date Pages REASUN FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS) 0 10/04/84 All Revised to add reference to status tree; delete indicator numbers; correct valve NG 21 19E,1,2,4,9 number.
1
..e 0280L/mbs
SQNP FR-C.1 Unit 1 or 2 Page 1 of 11 Rev. 1 RESPONSE TO INADEQUATE CORE COOLING A.
PURPOSE This guideline provides actions to restore core cooling.
B.
SYMPTOMS g
Refer to status tree C.
TRANSITION FROM OTHER INSTRUCTIONS Status Tree Iek
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SQNP l
FR-C.1 Unit 1 or 2 Page 2 of 11 Rev. 1 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTkINED l
CAUTION: If RWST level decreases to less than 29%, then align ECCS suction to the entmt sump using ES-1.2, Transfer To RHR Cntmt Sump 1
Verify ECCS Flow In All Trains a.
Both CCPs - RUNNING b.
Both SI Pumps - RUNNING c.
Both RHR Pumps -
RUNNING d.
Flow through BIT
[ YT e.
IF RCS press < 1500 psig, THEN verify SI Pump flow
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4 f.
.IF RCS press < 180 psig, THEN verify RIIR Pump flow g.
IF_ RHR aligned to entmt
- sump, THEN verify RIIR alignment per one of the following:
ES-1.2, Transfer To RHR Cntmt Sump -
Appendix ES-1.3, Transfer To Hot Leg I
Recire - Appendix l
SQNP FR-C.1 Unit 1 or 2 Page 3 of 11 Rev 0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE R_ESPONSE NOT OBTAINED 2
Open Ice Condenser AHU ACBs a.
Rx Vent Bd A-A Compt 6E and 7D b.
Rx Vent Bd B-B Compt 4D and 6E 3
Energize Hydrogen Ignitors a.
Pnl M-10 4
Start Charging PD Pump a.
Refer to SOI-62 g~
as required ri a
k I
9
. {
s.
SQNP FR-C.1 Unit 1 or 2 Page 4 of 11 Rev. 1 l(
k RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 5
Check Source Of RCS Depressurization a.
Pze PORVp - CLOSED a.
IF RCS press < 2335 psig, THEN close pzr PORV OR block valve b.
Letdown isolated
.y
- 1) FCV-62-69, 70, 72, 73, and 74 c.
Excess letdown isolated
- 1) FCV-62-54 or 55 l
d.
Pzr normal sprays - CLOSED
.e ef Aux spray valve - CLOSED f.
Pzr safety valves - CLOSED f.
Cooldown RCS and depressurize to allow safety valve to reseat g.
Reactor vessel head vent -
CLOSED h.
RCS sample valves - CLOSED
- 1) FCV-43-2 or 3
- 2) FCV-43-11 or 12
- 3) FCV-43-22 or 23 1.
Post accident sample valves
- CLOSED j
- 1) FSV-43-250 or 251
- 2) FSV-43-309 or 310
SQNP FR-C.1 Unit 1 or 2 l
Page 5 of 11
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Rev. 0 RESPONSE TO INADEQUATE CORE COOLING l
STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 6
Check RCP Status a.
IF all 4 RCPs running, THEN stop loop 1 RCP in order to reserve the RCP for future use i
b.
Do NOT stop any other operating RCP c.
Attempt to establish and/or maintain conditions necessary for RCP operation
- 1) Refer to SOI-68.2 l
as required
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d.* Do NOT attempt to restart any RCP at this time e. _ _ _ _ _ _ _ _ _ _.
SQNP FR-C.1 Unit 1 or 2 Page 6 of 11 Rev. 0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7
Check If Core Cooling Restored a.
IF core exit T/Cs < 700 F, a.
IF all of the following THEN return to instruction conditions met:
in effect Core exit T/Cs
< 1200 F Core exit T/Cs decreasing THEN maintain ECCL flow until core cooling restored IF any of the above I(
Enditions can NOT be
- met,
,e THEN continue with the next step 8
_ Check If Accumulators Available a.
IF UHI has NOT injected, a.
IF UHI has injected, TIIEN ensure UHI isolation THEN ensure isolation valves - OPEN valves closed and gagged b.
Restore power to cold leg accumulator isolation valves c.
Cold leg accumulator isolation valves - OPEN t'
SQNP FR-C.1 - Unit 1 or 2
' Page 7.of 11 Rev. 0 -
h-
. RESPONSE TO INADEQUATE CORE COOLING STEP ACTION /E.XPECTED RESPONSE RESPONSE NOT OBT INED 9-Check CST Level a.
CST level > 3 ft a.
I_F CST level < 3 ft, THEN verify ERCW -
flow to AFW b.
CST level > 17 ft b.
IF CST level < 17 ft,'
.THEN attempt to refill CST while continuing with this instruction 10 Check Intact S/G Levels a.
Narrow range S/G levels a.
Verify AFW flow and
> 25%-
intact S/G levels returning: to normal program J.
br ' Control S/G levels between 25% and 50%
.11 Cooldown RCS a.
Depressurize all intact S/Gs a.
IF NO intact S/G' exists, THEN use one non-intact S/G for cooldown b.
Dump steam to condenser b.
I_F condenser NOT F
available, THEN use intact S/G PORVs c.
IF core exit T/Cs c.
IF core exit T/Cs
< 1200 F,
> 1200 F, THEN:
THEN cooldown as quickly as possible
- 1) Cooldown as quickly as possible but do not
. exceed T-cold cooldown of 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 />
- 2) Maintain intact S/G levels s 33%
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SQNP FR-C.1 Unit 1 or 2 Page 8 of 11 Rev.0 RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED 1.ESPONSE RESPONSE NOT OBTAINED 12 During RCS Cooldown, Allow Accumulators To Inject a.
UHI
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- 1) Injection starts at 1200 psig N
- 2) AFTER UHI injection, l
ensure UHI isolation valves closed and j
gagged in order to prevent nitrogen injection into RCS b.
Cold leg accumulators
- 1) Injection starts at g
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s 400 psig k
- 2) WHEN RHR starts 2)
F isolation valve injecting into RCS, can NOT be closed, THEN isolate cold THEN vent any leg accumulators unisolated accumulators l
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SQNP FR-C.1 Unit 1 or 2 Page 9 of 11 Rev. 1 i
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RESPONSE TO INADEQUATE CORE COOLING STEP ICTIdN/5fPECfEU~55SPONSE
~
~ RESP 6 SE NOT DETAINED 13 Verify ECCS Flow Continue RCS cooldown until RHR starts infecting.
g a.
Flow through BIT g
b.
SI Pump f' low d'
c.
RHR Pump flow d.
WHEN RHR starts injecting into RCS, THEN:
- 1) Ensure UHI and cold
- 1) IF isolation valve leg accumulators En NOT be closed, isolated THEN vent any unisolated accumulators
- 2) Verify T-hot < 350 F j
THEN stop all RCPs 14 Check If Core Cooling Restored IF core exit T/Cs < 1200 F, THEN continue RCS cooldown a.
E all of the following and ECCS flow until core conditions met:
cooling restored
- 1) Core exit T/Cs E core exit T/Cs > 1200 F,
< 700 F THEN continue with the next step
- 2) At least two T-hot
< 350 F THEN return to instruction in effect
_9 i
SQNP FR-C.1 Unit 1 or 2 Page 10 of 11 Rev. 0 l(F '
RESPONSE TO INADEQUATE CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Check If RCP Must Be Started a.
IF core exit T/Cs > 1200 F a.
IF core exit T/Cs THEN
< 1200 F, THEN repeat the
- 1) Start one RCP; previous steps until Normal RCP starting core cooling restored conditions NOT required
- 2) Attempt to establish RCP support conditions while continuing
- 3) IF core exit T/Cs remain 21200 F, THEN start additional r
RCPs as required 4 (
- 4) E all available RCPs running and core exit T/Cs 21200 F, 1
THEN ensure at least
{
- running, THEN open all pzr PORVs and block l
valves
decision made to stop RCP 1
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SQNP FR-C.1 Unit 1 or 2 Page 11 of 11 Rev. 0 RESPONSE TO INADEQUATE CORE COOLING
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STEP
. ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED-1 16 Attempt To Restore Normal RCS Cooling a.
ECCS Systems:
- 1) CCP
- 2) SI Pumps
- 3) RHR Pumps
Secondary heat sink:
- 1) AFW Pumps
- 2) Main condenser or I
S/G PORVs
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- END -
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