ML19309B053

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Requests Util Propose Corrective Action for Deviation Noted in NRC Re Ability of Reactor Bldg Gaseous & Radioactivity Monitors to Detect Reactor Coolant Leak. Monitor Operability Range Should Be Shifted or Extended
ML19309B053
Person / Time
Site: Rancho Seco
Issue date: 08/07/1978
From: Reid R
Office of Nuclear Reactor Regulation
To: Mattimoe J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8004020532
Download: ML19309B053 (4)
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RHoodruff, I&E HQ b5 August 7, 1978 NRC PDR JLCrews, 'I&E N Reg V b#

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Docket No.: 50-312 BGr.imes TCarter E=9 =l RReid

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RIngram Sacramento Municipal Utility District... Attorney,_0 ELD... --....

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ATTN: Mr. J. J. Mattimoe

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Assistant General Manager.

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and Chief Engineer.

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6201 S Street

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P. O. Box 15830

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E =1 Sacramento, California 9581 h..._.,-. Gray Fil e..

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!=5E0 Gentlemen:

.SBlock 5?=9 E El By letter dated July 13, 1977,. from.J..L.. Crews _ to J. J..Mattime...,......,

which reported the results o.f.an inspection.of_ the. Rancho Seco........

.. "==9 facility, you were notified of. a.Deyiation. relating to. the, ability..

i==r' of the reactor building atmospher.ic, gaseous.and. particulate radio...._

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activity monitors to detect.lgakage.of. reactor. coolant. This Deviation occurred in part begause.of.your policy,of. minimizing..

the frequency of purging of the, reactor coptainment,to minimize.the... _.

the release of radioactivity. to..the,env.jronment.. As.a result, in....._..._.

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the absence of purging a bulldup.of. radioactivity due.to.ap. existing..,_.,,. _

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very small leak in the reactoncoolant. system caused radioactivity..

levels within containment to accumulate.to.the. point where both.the.

gaseous and particulate monitors were.at.or near.. full scale indication......_

These monitors were thus incapable.of detecting _further. increases.in........

, t;;sr airborno activity that could occur as.a. result.of. a significant G;;

increase in reactor coolant leakage.. The purpose of this letter,.

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therefore, is to request that you.. propose. corrective action which.wil)....

.... p' either shift or extend the operability. range.of.the. containment.

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atmosphere gaseous and particulate nonitors, or. provide additional......

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instruments with an appropriate.oper.ating range,. _

.p With regard to this request please. note. that ye. fully, support your policy of minimizing releases.of radioactivity,to the environment...

and thus support your policy.of minimizing purging of.the. containment.....

Accordingly, we urge that any. corrective, action you propose be. con-..

sistent with continued adhere.nce to.this, policy.

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Sacramento Municipal Utility.

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We also note that in your letter of August 8,1978,. to.R. H.,Engelken,,,...,.,

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you supplied calculations supporting.the. contention.that the. area..

radiation innitors.in the reactor. containment.could serve.as s. backup.

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to the gaseous and particulate _ monitors.in. detecting reactor coolant...

1eakage if the reactor contained.0.1%.or 1%, defective fueln. Supple..

mentary discussions with R. W.,Columbo.of your. staff., however,_ indicate

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that with the small percentage.of_ defective fuel. currently.in.P.ancho.

Seco, these area monitors probably..could.not serve.as an. effective and.

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timely backup to the gaseous.and. particulate.moni. tors.. Accordingly,.......,

.if these area mnitors cannot effectively detect reactor coolant.

leakage under expe.:ted or actual operating. conditions.,there does not... _ _.._ j= =""=-

g appear to be a basis for including.them as a backup to the gaseous

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and particulate monitors.

E While we do not wish to circumscribe your options.with respect to.the.

.E appropriate corrective action,.we,do. cote that_the.present problem...

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appears to stem from the high. sensitivity.of the. instruments. presently..

used for gaseous and particulate. monitoring,.That is,,yery..smal1..

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leaks of primary coolant containing low leyels of radioactivity.can,.....

in the absence of containment puraing,_ saturate the present instruments,.

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in a relatively short period.of time....The. general. nature.of the...

corrective action, therefore, would. appear to.be to either reduce the...

t sensitivity of the present instruments.or provide. other instrument (s).

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i capable of providing a useful.. indication in the. event of.significant

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.E:! ~.:.:i reactor coolant leakage against.a. background produced by anticipated operating conditions involving,very low rates of primary. coolant. leakage.

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j Based on the above, it is requested that you. promptly.. initiate.appro-priate corrective action.

If your safety review of the proposed,... _

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corrective action indicates that.such action involves.an.unreviewed

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safety question, a description.and. safety evaluation.of the proposed i='

action should be submitted for our.. review and approval prior to...

implementation, pursuant to 10 CFR.50.59...If you determine that_the.

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E proposed corrective action does not involve an unreviewed safety...

question, it is requested that the action.be. implemented within,120..

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days of the date of this letter...

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Sacramento !!unicipal Utility p.... _

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i It is further requested that you submit within 60 days of receil t.,.

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of this letter, a sumary which describes.your. proposed corrective. _.

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action relative to this natter,and,the. schedule.for. implementation._......

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Sincerely, f:::=

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Robert W. Reid, Chief E:

Operating Reactors Branch #4.......

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Division of Operating Reactors _.,

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cc: David S. Kaplan, Secretary and

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...;.a General Counsel I

1 6201 S Street I

"Tj Post Office Box-15830 i = - -i Sacramento, California 95813 E2

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..q Business and tiunicipal Department

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Sacramento City-County Lib.rary

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Sacraniento, California 95814 l

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