ML19322C312
| ML19322C312 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco, Crane |
| Issue date: | 03/23/1978 |
| From: | Janis J BABCOCK & WILCOX CO. |
| To: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160834 | |
| Download: ML19322C312 (2) | |
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This is a typed copy of a letter B3M telc<opied.
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BAPIOCT, f. )!ILC0X Pater Ganeration Group P. O. Box 1260 Lynchburg, VA 24505 R3rch 23,1978 (2rweso Seco Mr. R. J. Rodriguez NAftCW GO,1978 Manager, fioclear Operations Sacramnto Municipal Utility District
. crcr.ai Ca li fornia 95813 Cubject: } Rancho Seco Hoclear Genera ting Station. - Dait Ho.1
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' Evalua ti6n' of HSS Cooldown Transient Daar Mr. Rodriguez:
BAH hasIreviewed the data provided by SICD regarding the Arch 20.1978.
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reactor trip and resulting cooldo.<n transient, and have"perforced the foll e.fi ng eval ua tions :
1.
Evaluation of RCP seal performoce data print,- during and subsequent to the transient.
2.
Evaluation of transient conditions with respect to RCP's end. CRDWs.
3.
Evaltation of transient conditions with respect to fuel assemblies.
4.
Evaluation of transient conditions 'with respect to RV, RC piping, pnassurizer, and OTSG's.
f.s a re, ult of these, evaluations,iBaW concurs kith SM3D's intent to returri 1
Rancho.Seco to powerjoperation at a power level 'at or~ beloW 750 full. 'pm.ar j
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the foilouing recceandations.
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The following caneuvering limits be applied for this plcnt start-up:
The taxic:.:a rate of powar increase below 20% full pomr shall be a.
10% por hour.
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Th e ra x i re:xn ra te o f pova r inc rea s e be twee n 20 % a n d t.0% rul l po we r shall be 30% per hour.
Above /,0% full powar, escalation shall be limited to 3% par hour.
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2.
Incmase surveillance of the loose parts r:onitoring systen for at least a one 1;221: period.
8 0 01160~ [3 Y [
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4 EAECOCT, & hit.COX 3
JANIS TO R00RIGUEZ l' arch 23,1978 j
3.
Perforr.ance of an operability check of on-line and redundant NNI ins trumen ta tion.
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Establishnunt of a procedure for restoring Ni(I power in the eYent of a pe. er loss and a corc;ai trant to establish by April 7.1978 opera tor instructions for ircediate action to limit NSS transient if HNI poster cannot be ir.wdf a tely res tored.
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Surveillance of pricary and secondary radiochenistry on a ninicta of 1
a daily basis for at least one week following start-uo.
j B&W HPGO's concurrence with operation of Rancho Seco above 75% full power is contirigent upon our Q% cvaluation of data input provided by Sh'to cnd analyses l
perforced by bah Engineering, and you will be informd of co:pletion of those activities and our concurrence in' a timely canner.
I In addi tion,\\ B&W is.perforcring an evaluation toMteimine the effects of the
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translent conditions; pn..the.Repctor Coolant.. System accv=ulati've usagef factor z
a'nd will advise you of thote rtsul ts.
As a forther reasure of verification i
I of OTSG tuba integrity, BMI rpb,uests additional inspection of the ~0TSG tubes during your next refueling cutVya.
Those inspection reco=andations will be 4
forwarded to SHUD along with Bars proposed refueling inspcction plant prior to the outag
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~i If you have any questions br i%pire additional infort 2 tion, please advise,
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Very truly yours, 'n
/s/' Joel T. Janis Joel T. Janis Service Ibnager JTJ/hh cc:
J. J. luttimoe t
D. G. Raasch e
R. P. Oubre
J. H. Johnston a
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This is a typed copy,of a letter B&W telecopied
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