ML20206K579

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Summarizes Data Obtained from 750403 Telcon W/F Giardello Re Airborne Effluents.Recurrent Problems of Excessive Iodine & Particulate Releases May Be Imminent.Close Scrutiny of Release Trends Would Be Prudent
ML20206K579
Person / Time
Site: Pilgrim, 05000000
Issue date: 04/11/1975
From: Hyson R
NRC
To: Knapp P
NRC
Shared Package
ML20204E974 List:
References
FOIA-86-58 NUDOCS 8606300131
Download: ML20206K579 (2)
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kUVj TO: Peter Knapp AIRBORNE EFFLUENTS - PILGRIM gog i i1975 During a telephone conversation on 4/3/75 with F. Giardello Chem j Tech for Pilgrimm 1, the following data were obtained in response to my questions:

1. Thereleaseofairborne.iodinesandparticulates4tg>8d)fromthe plant from 4/2-4/3 was %86% of the Tech Spec l'.mit with the power level at 80%.

(This is up from the reported 30% at an equivalent power icvel + 2 months ago)

2. The Tech indicated that this apparent rise in iodine and particulate (I&P) releases has been gradual over the past few months.
3. The consultant (Pelletier) is continuing to obtain grab samples for his on-going study of the I&P release problem, which caused Pilgrim to exceed 'rS limits twice in January and which precipitated a special inspectior in January by this office (50-293/75-01 & 75-02)
4. The Reactor Building Vent (Plant Vent) is responsible for over 98%

of the %-Age of TS limit for I&P being released.

5. The Tech believes the increase in I&P' releases are due to increasing fuel leaks.
6. The stack gas, off gas (sum of six at SJAE) and plant vent gas release rates and the. reactor coolant iodine levels remained steady since the end of January, 1975.

(This information casts doubt on the belief expressed in 5. above)

7. The reactor cleanup demineralizers will be regenerated within a few days.

(This will introduce an increased source of iodine into the radwaste system which may indeed increase the iodine in the radwaste ventila-tion system)

On the basis of the above " unofficial" info I fear recurrent problems of ex-cessive I&P release may be imminent.

i Also on the basis of the above " unofficial" infdrmation I would theorlze o.ne of the following as a possible cause for the present upward trend in

. I&P release rates:

( Y t t., A u b,A .-  % ukh wa, 49 M. Q w.E e A

% iw B606300131 860613 PDR FOIA BURNSTEIB6-58 PDR C-q L.

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1. The charcoal' filters which were installed to decrease the I&P re-leases from the plant ventilation may be losing their efficiency due to increased relative humidity, leakage, etc.
2. Increased sources of iodine from reactor water (via sumps or drains) are entering the radwaste system which ultimately vent to the plant venti 34Aion system.

In order to gain a better understanding of Pilgrim's present release status & to determine if further action by IE:I is necessary I asked Giardello to have R. Smith, Pilgrim's Chemist, call me on Monday (fol-lowing his vacation) with more pertinent and more official data on re-lease rates (stack gas and I6P's, plant vent gas and I&P'e, off gas) .

and primary coolant total iodine concentrations.

I feel that a close scrutiny of release trends at Pilgrim would be  :

prudent at this time because: '

1. Pilgrim has already exceeded the I&P TS limit twice this year.
2. We had so many adverse repercussions from the recent Millstone release which exceeded TS limits (even though they were liquid)
3. At this time based on the reported preliminary data, the trend of I&P release rates is increasing with no sign of leveling off.

The essence of this memo was related to G. Snyder in the absence of D.

Sternberg and T. Shedlosky on 4/3/75.

sk . W Robert R. Hyson Radiation Specialist cc: .

C. Knapp D. Sternberg G. Snyder c

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