ML20024B410
| ML20024B410 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/11/1979 |
| From: | Fairburn G BABCOCK & WILCOX CO. |
| To: | Geoffrey Miller METROPOLITAN EDISON CO. |
| Shared Package | |
| ML20024B411 | List: |
| References | |
| TASK-*, TASK-GB GPU-2502, TMI-79-67, NUDOCS 8307080670 | |
| Download: ML20024B410 (4) | |
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P.Q.Scs L2SC.Li 44 sg.Ya 245CS Tenscnme: (aFA 384.s111 May 11,1979 TMI-79-67 r.
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Mr. G.P. Miller Station Superinter.f.ent L
Metropolitan Edison Cocoarty T
P.O. Sex 480 E
Middlet::wi. PA 17075 F
Subject:
Operating Guidelines for Sca11 Breaks Referen::: Letter TM'-79-65 dated May 8,1979 r:
Dear Mr. Miller:
The refere-ce letter fon.arVed for ye'.? inferr.atien and use a.do:ument r;
- era-ir.g Fre
- edure Gaidelines for Scall Breaks". Attached entitled is a revised cc:y of t e su:: ject guicelines. ~ This guideline was revised
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to a:
,: ate N7.". ::-rents received en May 8 and May 9.
There have been cajor c.anges in instr.;;;i::.s for restarting reactor coolan. pumps and the grades for M. I throttling.
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A;;endix A, titled "L2I Cooling" sh:uid te exa:ined and adjust:ments t'
ca:e in your decay seat systa=, L31 sys.e=, and reacter coolant systes s
cperation to ac xrc: ate plant-s:edific c nditions.
If you have any questions, please advise.
Very truly purs,
.,p. D. 32 A u
o G. T. Fairturn
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Based up d discussi s with the NRC and conti d in-house I
review, the following basic changes have been =ade to the operating guidelines.
!.:Ts.
.1.
Co=: ent:. A fault tree or flow diagran would be useful.
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. Response: A flow diagran has been prepared and attached to the guideline.
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2.
to== ent : The cooldern procedure and tra=sfer of operation to LPI cooling cight distract the operator from
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his ic=ediate actions. Soggest you put it in an appendix.
Resnonse:
The infor=ation has been put in an appendiz.
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3.
Com=ent: The isolation of the stea= generator section is confusing.
q.
Response: This section has been revised to tell the operators k
to isolate the " bad" generator.
L 4.
Cor= ent:
Is there a concern for overpressurizing the pri=ary
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.syste= on Loss of Offsite Power (No RCP's)?
-Response: Precaution 3.1 has been modified to delete the
-require =ent for pu=p operation.
5.
Coc=ent:
It is reco== ended that operators: verify instrument responses by checking redundant sensors, c
Response: Precaution
.3.5 has been added.
-6.
Con =ent: Write-up a purpose and place it at the $eginning
.of the guideline.,
. Response: The individual utilities can male the-change as L
they deen necessary.
.7.
4",on=ent :
Is there :ny concern with the number of reactor 0
coolant "bu=ps"?
5 Response: BUf had already taken actions to revise this section.,
L 3.
Comnent: Since it is very inportant to get 'feedvater back, it is recom= ended that sections.4.2.and 4.3 be interchanged.
L Response: Sections 4.2 and 4.3 have been. interc' hanged..
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Cor:sent: Why is the PCRV opened in sectim 4.3.
[.) g i5 Response: The PORV is opened because it cza be isolated in
,_ p event'of valve failure. The intent 2.s to Keep p
a from pressuriting to the safe:7 valves. A note
{
o has been a*dded to the appropriate section.
G Additional emphasis needs to be gi~res to uaint2in.
10.
Comment:
HPI flow and returning and, ass = ring fee 6*-ater floit.
Respera e: Section 4.2 (old 4.3) has been modified as a result
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of this request.
11.
Comment: The fact that pressuriter te=perature is approxi=stely
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equal to the, hot leg te=perat tre is an indication 6
of a LOCA.
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Response: New section 3.4.7 has been added.
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