ML20237H967

Rev 2 to Emergency Instruction E-2, Faulted Steam Generator Isolation

ML20237H967
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Site:	Sequoyah
Issue date:	05/22/1987
From:	Strickland G, Terpstra G TENNESSEE VALLEY AUTHORITY
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References
E-2, NUDOCS 8708170440
Download: ML20237H967 (6)

Text

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',,1 TENNESSEE VALLEY AUTHORITY f

SEQUOYAH NUCLEAR PLANT

- k EMERGENCY INSTRUCTION-i E-2

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FAULTED' STEAM GENERATOR ISOLATION s.

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s 5

Revision 2 PREPARED BY:

G. Strickland RESPONSIBLE SECTION: Operations i

REVISED BY:

Gary L. Terpstra SUBMITTED BY:

N.

x,-

ReponsibleSection\\ Supervisor PORC REVIEH DATE:

APPROVED BY:

P1 ant Manager

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DATE APPROVED:

MAY 22 7007 Reason for revision (include all Instruction Change Form Nos.):

RevisedtochangeHPtoRADCON: step 1 - added S/G level to RNO in determin-s ing faulted S/G, and step 2 - added part a RNO (comment from training) and part d RNO (WP 12188).

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The last page of this instruction is number:

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8708170440 870811 PDR ADOCX 05000327 P

PDR

l SEQUOYAH NUCLEAR PLANT PLANT INSTRUCTION REVISION LOG

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EMERGENCY INSTRUCTION E-2 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected MENTS AND ALL ICF FORM NUMBERS)

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0 10/04/84 ALL Revised to add transitions from other

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l 08/21/85 1

instructions.

Revised to change HP to RAD CON; step 1-added S/G level to RNO in determining faulted S/G, and step 2 - added part a htAY 2 2 1987 RNO (comment from training) and part d 2

2,3,4 RNO (WP 12188).

a.

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1 0271L/cdb l

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f SQNP E-2 Unit 1 or 2 Page 1 of 4 Rev. 1 FAULTED STEAM GENERATOR ISOLATION A.

PURPOSE This guideline provides actions to identify and isolate a faulted S/G.

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s B.

SYMPTOMS 1.

S/G press 100 psi lower in one S/G than the oihers 2.

Any S/G press decreasing in an uncontrolled manner

-1 C.

TRANSITION FROM OTHER INSTRUCTIONS 1.

E-0, Reactor Trip Or Safety Injection f

2.

E-1, Loss Of Reactor Or Secondary Coolant

..w.

3.

Foldout page

)[-

4.

FR-S.1, Response To Nuclear Power Generation /ATWS

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FR-z.1, Response To High Containment Pressure L:

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1 mah

SQNP E-2.

Unit 1 or 2 Page 2 of 4

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.I FAULTED STEAM GENERATOR ISOLATION

. k, STEP ACTION / EXPECTED ' RESPONSE.

RESPONSE NOT OBTAINED r.

1 Identify Faulted.S/G IF faulted S/G can NOT be Identified,

. Any S/G press decreasing THEN:

a.

'in an uncontrolled manner Check S/G enclosure b.

Press in one S/G' lower temp T1002A and than the others T1003A Search.for break in main 'steamlines, main feedlines, and other secondary piping IF faulted S/G NOT identified,.

THEN:

AFTER all S/G narrow

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range levels > 25%,

THEN close all MSIVs, MSIV bypasses, and isolate all AFW Check for uncontroHed decrease in S/G press or level to identify l

faulted S/G IF faulted S/G NOT iifentified, THEN go to step 3 4

SQNP i-E-2 Unit 1 or 2 l.

Page 3 of 4 L

Rev. 2 -

-FAULTED STEAM GENERATOR ISOLATION STEP.

ACTION / EXPECTED RESPONSE.

RESPONSE NOT OBTAINED i

CAUTION:

At least one S/G must be maintained available for RCS cooldown.

CAUTION: The pressure difference between the RCS and the faulted S/G should be maintained less than 1600 psid.

1 2

Isolate Faulted S/G a.

Close faulted S/G MSIV and.

a.

I_F MSIV or bypass MSIV bypass.

can NOT be closed, THEM cTose:

1) Intact S/G MSIVs and bypasses

2) HP steam to MSRs and MFW pump turbine

3) Condenser steam dumps

4) Steam seals b.

Close AFW c.

Ensure main FW - ISOLATED d.

Ensure S/G PORV - CLOSED d.

Locally,close S/G PORV from 480-V SD Bd Rm (S/Gs 1 and 4) or annulus (S/Gs 2 and 3) e.

Ensure blowdown - CLOSED f.

Ensure turbine - driven f.

IF both S/G 1 and 4 ~

AFW pump being supplied

Taulted, from intact S/G THEN verify at least one motor-driven AFW pump aligned to an intact S/G, g

THEN stop turbine -

{k driven AFW pump SQNP E-2 Unit 1 or 2 Page 4 of 4 Rev. 2 j

FAULTED STEAM GENERATOR ISOLATION

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I STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION:

Any faulted S/G or secondary break should remain isolated during subsequent recovery actions unless needed for RCS cooldown.

3 Check Secondary Side IF secondary side radiation Radiation - NORMAL is high, THEN go to

• E-3, STEAM a.

Condenser exhaust monitors GENERATOR TUBE RUPTURE b.

S/G blowdown monitors IF condenser exhaust and 37G blowdown monitors NOT available, THEN:

Notify Rad Con to l

survey main steamlines and S/G blowdown lines Notify chem lab to l

sample S/G activity Check RM-90-124

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Aux Bldg 690 4

Go To E-1, Loss Of Reactor Or Secondary Coolant j

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