ML20237H714
| ML20237H714 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/29/1987 |
| From: | Nobles L, Strickland G, Terpstra G TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20237H133 | List:
|
| References | |
| FR-I.3, NUDOCS 8708170321 | |
| Download: ML20237H714 (14) | |
Text
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TENNESSEE VALLEY. AUTHORITY- .
SEQUOYAH~ NUCLEAR PLANT' .
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FUNCTION RESTORATION GUIDELINES ,,,
y FR-I.3 l
'* RESPONSE TO VOIDS IN REACTOR VESSEL ~
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1 Revision 1 t ;
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., PREPARED BY: G. Strickland RESPONSIBLE SECTION: Operations ;
I REVISED BY:
Gary L. Terpstra -
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SUBMITTED BY: ///. d s b _ p-i .m *-
Resgsib'le 'Section $pervisor.
PORC REVIEW DATE: APR 2 919R7 , _
APPROVED BY:
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Plant Manager DATE APPROVED: PR 2 91987 _,
Reason for revision (include all Instruction Change Form Nos.):
Revised graph and Appendix A presentation to meet good human engineering p gn_giples (Report LO2 861002 897 and CRDR HED 301.)
l The last'page of this instruction is number: 12 n,
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,. 9 SEQUOYAH NUCLEAR PLANT
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PLANT INSTRUCTION REVISION LOG .
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FUNCTION RESTORATION GUIDELINES FR-I.3
.- REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-
. LEVEL' Approved MENTS AND ALL ICF' FORM NUMBERS)
Affected
- l. a', New instruction written per commitment 0 08/21/85 All
- to hUREG 0737
- i Revised graph and Appendix A presenta-L(;' 5 tion to meet good human engineering Principles. (Report LO2 861002 8M and 1 APR 2 9 1987 11,12 CRDR HED 301.)
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SQNP FR-I . 3 Unit 1 or 2 Page 1 of 10 Rev. O I -
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( RE5PONSE TO VOIDS IN REACTOR VESSEL '
A. PURPOSE ~"':. .l.'
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This guideline provides actions ~to respond ~ to~ v oids in the reactor vessel.
B. S YMPTOMS ._ __ . _..____.._.___________
Refer to Status Tree C. TRANSITION FROM OTHER INSTRUCTIONS ,
Status Tree
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, SQNP FR-I . 3 Unit 1 or 2 Page 2 of 10 Rev. O F
I k RESPONSE TO VOIDS IN REACTOR VESSEL
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1 Check If SI Has Been Terminated I_F SI has NOT been terminated ,
- a. BIT has previously been THEN do NOT use this isolated instruction . Return to instruction in effect
- b. SI Pumps have previously been stopped 2 Check Charging In Service IF charging isolated, THEN establish a charging
- a. Charging flow established
- a. Close FCV-62-89
- b. Open charging
( line isolation l FCV-62-90 and 91
,k *
- c. Open FCV-62-85 ,
or 86
- d. Adjust FCV-62-89 and 93 to estabhsh following:
- 1) Seal injection flow 8 gpm per RCP
- 2) Pzr level stable
- e. Open seal water return FCV-62-61 and 63
(
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SQNP l FR-I . 3 Unit 1 or 2 1
(
Page 3 of 10 l Rev. O i
RE5PONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l l
3 Check Letdown In Service __
Establish letdown:
- a. Verify one
- a. Letdown flow established charging pump running
- b. Open letdown isolation valves: .
- 1) FCV-62-69
,,, 2) FCV-62-70
- 3) FCV-62-77
- c. Adjust letdown press controner FCV-62-81
, (- ,
~ 25% open and in manual
- d. Open an orifice valve
- e. Adjust 7CV-62-81 for desired press, then place in AUTO
- 1) 320 psig at normal letdown temp IF letdown can NOT be Etablished, THEN establish excess letdown O
SQNP FR-I.3 Unit 1 or 2 Page 4 of 10 Rev. O I
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( RE$PONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4 Start All CRDM and Lower Compartment Fans
- b. Maintain entmt within Tech Spec air temp limit 5 Stabilize Pzr Level ,
- a. Establish pzr level between 50% and 60%
- b. Control charging and l( letdown as necessary sk
- 6 Stop RCS Depressurization
- a. Control pzr heaters as necessary
- b. Ensure pzr normal sprays
- CLOSED
- c. Ensure pzr PORV -
CLOSED
- d. Ensure aux spray -
CLOSED
-4 L . . _ . _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ _ _ _ _ . _
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, SQNP F R-1. 3 Unit 1 or 2 Page 5 of 10 Rev. O C -
RESPONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7 Stabilize T-hot _
- a. Transfer condenser steam a. IF condenser NOT.
dump to press control available, mode THEN use S/G PORVs
- b. Control steam dump as necessary ,
)
- a. Maintain pzr level > 50%
- b. Maintain RCS temp and
[{(. < press within normal cooldown curve (TI-28)
- c. Turn on pzr heaters to increase RCS press 9 Check If Void Collapsed
- a. IF pzr level behavior a. IF pzr level behavior normal, abnormal after THEN stabilize pzr RCS p. pressurization, level. Return to TIIEN continue j instruction in effect with the next step 1
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, SQNP FR-I . 3 Unit 1 or 2 Page 6 of 10 Rev. O
( RESPONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED Note : If the void is noncondensible (Nitrogen injection from accumulators or Hydrogen production from inadequate core cooling), then do not restart an RCP until after the reactor vessel head is vented. Go to step 12.
10 Start RCP To Collapse 'IF an RCP can NOT Upper Head Void be started, THEN verify natural
- a. Restart an RCP .,. circulation
- 1) Loop 2 preferred RCS subcooling
- 2) Establish pzr level S/G press stable
> 50'h or decreasing g( I( *
- 3) Establish RCS T-hot stable or subcooling > 80 F decreasing
- 4) Refer to SOI-68.2 Core exit T/C stable decreasing
- b. IF 5% [20%
pzr level FOR falls below ADVERSE T-cold at saturation CNTMT), temp for S/G press THEN IF natural circulation
~
- 1) Evaluate stopping RCP 'NOT verified, THEN increase
- 2) Evaluate restarting dumping steam ECCS Pumps O
t - - - - - - - - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
SQNP FR-I . 3 Unit 1 or 2 Page 7 of 10 Rev. O RE5PONSE TO VOIDS IN REACTOR VESSEL
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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 11 Check If Void Collapsed
- a. IF pzr level behavior a. IF pzr level behavior normal, abnormal THEN stabilize pzr THEN consult with l
level. Return to TSC during instruction in effect reactor vessel vent per followmg steps 12 Open Ice Condenser AHU ACBs
- a. Rx Vent Bd A-A Compt GE and 7D
- b. Rx Vent Bd B-B Compt 4D and 6E lg
'# k 13 Energize Hydrogen Ignitors 1
- a. Pnl M-10 I
14 Place Cntmt Hydrogen Analyzers In Service I
- a. Refer to SOI-43.1 l e7-
, SQNP FR-I . 3 Unit 1 or 2 .
Page 8 of 10 I Rev. 0 1
RESPONSE TO VOIDS IN REACTOR VESSEL 1
STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Block Low Pzr Press SI
- a. Decrease RCS press
< 1970 psig
- b. Block P-11 10 Prepare Cntmt For Reactor Vessel Venting
- a. Start all CRDM fans ,.
- b. Start all upper and lower entmt coolers l c. Isolate entmt purge and exhaust lx 17 Check PRT
- a. IF rupture disk intact, a. IF rupture disk THEN: NOT intact, THEN:
- 2) Adjust PRT level to venting maximize vencing capability Notify TSC to evaluate starting air return fans IF air return fans started, .
THEN ensure entmt vacuum relief valves in service when entmt press
< 1.5 psig g..
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SQNP FR-I . 3 Unit 1 or 2 Page 9 of 10 Rev. O
( REdPONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Determine Maximum Allov;able Venting Time ,
- a. IF cntmt hydrogen a. IF cntmt hydrogen concentration < 3%, concentration between THEN calculate max vent 3% and 6%,
time per Appendix A THEN place recombiners
~
in service to decrease cntmt hy 'rogen < 3%.
' Refer to SOI-83.
19 Start Reactor Vessel Venting
- a. Open one vent path l
(- 1) Open FSV-68-394 1) IF FSV-68-394 can NOT be opened,
- ( ,
THEN open FSV-68-395
- 2) Slowly open 2) F FCV-68-396 FSV-68-390 can NOT be opened, THEN slowly open FSV-68-397 S
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SQNP FR-I .3 Unit 1 or 2 Page 10 of 10 Rev. 0
( RESPONSE TO VOIDS IN REACTOR VESSEL STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED, 20 Check If Venting Should IF, any of the criteria Continue can NOT be satisfied, TIIEN :
- a. RCS subcooling > 40 F t
Stop vessel venting
- b. Pzr level > 50%
Restore all parameters
- c. PRT press < 40 psig within limits prior to resuming vent operation
- d. Cntmt hydrogen < 3%
) c. Max vent time not exceeded a.
21 Check If Void Collapsed IF RCS void NOT collapsed ,
_ a. IF RCS void collapsed THEN continue venting
/
as determined by while observing
, , one of the following: above limitations
- 1) Pzr level behavior normal
- 2) PRT level increase THEN stop vessal venting and stabilize pzr level 22 Return To Instruction In Effect l l
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SQNP FR-I . 3 Unit 1 or 2 Page 1 of 1 Revision 1 APPENDIX A '
RESPONSE TO VOIDS IN REACTOR VESSEL -
f[\ 1. Lower cntmt temp (obtain from SI-3): F
- , 2. Cntmt press (check which one used)
- psig
. PDI-30-44 PDI-30-45 -
P250 (P1002A) P250 (P1003A)
>~
TSC ccfnputer r- - 3. Cntmt hydrogen concentraticin (check which one used): %
1 s H21-43-200 H2I-43-?10 I
Chem Lab sample
- 4. Convert Item 1 from F to R:
Item 1 + 460
,, + 460 = R
- 5. Calculate lower entmt volume at standard temp 5 3 492 R ;
,3.83 x 10 ft 7 Item 4
, , 492 R ,3.83 x 105 ft3=_ 3 ft R
,,. (3% - Item 3)
- Item 5 100%
'L (3% - 3 = 3
%)
- ft ft 100%
- 7. RCS press (check which one used): psig i
PI-68-66A PR-68-69 L.
TSC computer
?
- 8. Determine hydrogen flowrate using Figure 1 and Item 7: SCFM f' NOTE: Use lowest of the two vent times. -
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- 9. Calculate max venting time:
- a. Item 6 ft3= min Item 8 = SCFM
}s b. RCS voids ft3 (determined from TI-92) = ft = min j Item 8 SCFM j
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