ML19220C295
| ML19220C295 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/03/1978 |
| From: | Silver H Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904300150 | |
| Download: ML19220C295 (6) | |
Text
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Pro.iect Stana;;e :
Harley Silver L
ilu lm a n Attorney ELD R.
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Dreh<i-Frank Ashe Jim Stai:
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Occket fics: 50-320 FACILITY:
ThreeMile Island Unit 2 APPLICAffT: Metropolitan Edisen Comcany SUBJECT?
St7dARY OF MEETING OH OPEN IHMS Representatives of the applicant and his contracton met with mer,6ers of the staff (list of attendees enclosed) on Decerber 8,1977, to discuss the resolutica of various open items as, follows.
MU-V-12 (Excessive drwkun of the cateuc tank in a LOCA)
The applic.;.nt proposed to rearrange the alignment of the three high pressure injection puaps so that in the vent of a LOCA, with or without offsite power, only two HPI ptsaps will operate..one taking suction on the bc, rated water storage tank, the other on the makeup tant. In this configuntion, the applicant states that suction conditicas are such that the BWST elevation provides 5;.ifficient head to preclude flow odtfof 'theTJ tank':iantil ~theTBWST level drops sufficiently. At this time, flow will cc::cence fm the HU tank, but until switchover totthe recirculation mode a leg of water will always be maintained in the HU tank or line fmm the tant. After switchover, the HPI ptscs take suction fm the low head pumps, rather than the HU tank. Therefore, according to the applicant, the MU tank and line cannot be drained to the point where the tank hydrogen cover gas can be pulled into the pumps possibly causing pump da= age.
Questions were raised about the t ydrogen contal valving and MU tank charging J
procedures. The applicant will address these conceres in tWinfomation to be submitted by the applicant to docu=ent their presentation.
Baron Flow Sensors The applicant iciu s cd tbathecdescciptite infocIation arovidid in'/ advance
. copies of pages from Acendment 61, to be formally subtritted en Dececeer 16, 1977. With regard to tests to de: castrate systen capa'ility and to calibrata c
instrumentation, the appitcant stated these will be performed by cosoletion of lct power physics testing.
Electrical Site Visit Itec:s Again the applicant referenced advar
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.s M 03 E Metro"w tan Edison Comcany Reactor Building Scra/ Purc NPSH The applicant presented new curves showing systeen flow characteristics, pump head curves, and resultant NPSH required. A letter fmm S&W (enclosed) was presented, indicating their expectation that the "A" pumo could operate 3 to 5 days without significant damage at the NPSH available. at Witch point it would show a 5% head loss. The applicant proposes no physical fix, but rather administrative action to. thrcttle flow via push-button valve control, within 3 days. The applicant further noted that procedures call for flow throttlino to the nominal 1500 GPM in the infection mode (within 45 minutes afterthe postulated accident). If this is done, flow in the recirculation mode would be such (1770 GPM) that available NPSH is adequate for continuous pump operation. Throttling to 1500 GPM in the recirculation mode would further imorove the situation.
The applicant also stated that pump vibration during testing at icw NPSH conditions res01ted in pump vibration within limits specified for r.ormal operation.
The applicant will document informatian to us regarding their proposal, including all test infomation, procedures, pump descriptive infomation, impeller tip speed, actual NPSH available, and system characteristics as verified by preoperational test data..
Lono Term Cooling The applicant stated that a letter report will be submitted by December 16, 1977.
crisim b iG2*dDU Harley Silver, Pmject Manager Light ' dater Reactors Branch No. 4 Division of Project Management iO a
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ATTENDEES - OPEN ITEM TMI-2 MEETING - DECEMBER 9, 1977 Harley Silver, NRC Frank Ashe, NRC Jim Stair, Met Ed D. T. English, Burns & Roe Richard Schlosser, Burns & Rce S. A. Morrison, Burns & Roe L. Diaz, Burns & Roe J. J. Watt, NRC Lou Lanese, GPUSC Mike Morrell, GPUSC Frank Eltawila, NRC Jim Shapaker, NRC U!
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s Mr. Scott Dam Surns & Roe, Inc.
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Subj ect : 3 ree Mile Idand Suclear Station, Unit J2
- 2. P,. SPPaY PUPS B&W 2eference, SSS-6 A'O l
Gentlemen:
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e This is in response to the action item assigned te 30.. at tite No terbe r 2.
19~7 meetin; with NRC on the subject of R.S.
Spray Dumps and 'tc a c to r.:uildin; J ' ra-System operation.
The per formance of the R. S.
Spray Pump units has been re'.;ewed by u...
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e Mechanical Systems and the manufacturer, B&'s Cannda, using the systcc re s t, t in ~ e curves supplied by Burns & Roe and the following conclusions have been r.:. n e d.
Puno PI3 Unit 5/.1 07942 Dur review indicates that this punn would oper.1:e at IMi PM it. !e re to,:ed head of 405 feet for the recirculation mode of operatien.
wir a th;, o '.
.t i u l limit established, a head loss of 1.5.';
is expected inc th-rc is no.i ; i i t t.
operating restriction required with respect to ope r 2 t in g t ime.
Pumo PlA, S/N 67943 The review of this unit indicates that it would ocerate at 1340-1350 CPM at i developed head of 115 feet in the recirculatien mode, ree ltine in :
5~, hem.
ioss.
We have no operating history on this unit design rperat ing at 57, head irss.
However, a conservative engineering j udgren t is that this unit could noernte 3 to 5 days without significant mechanical damare.
If operition action
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be expected within this time frame, to limit this # 1c w ta ;820 GFM max, systen modification to install additional rasist ance wauld be re,uircd.
With this unit operating at 1S20 GPM, the heaa loss -.ould ue aoprmi.a te c O
NN lie o a 4 -
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Babccck&Wilcox Mr. Scott Dam 3arns 5 Roe. Inc.
Subject:
R.3. SPRAY PUMPS A
"'T and the unit could operate without restriction an ip-ratine t i:.t-operation is well within the standard 3~ as defined h-
- r. h e :ty:f rao ! L - Instirit.
Please advise us of your decision with respe.t to operatica o.f puuo Pl.i.
If you have further questions on this subject, please advise.
Yours very t rul:..
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Barton. CPU Cooden Gray, New York Sales (Via Telecopy to Scott Dam ')
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