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p UNITED STATES ATOMIC ENERGY COMMISSION DIRECTOR ATE OF REGUL,ATOHV OPER ATIONS
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REGION 4 43t PARK AVENUC -
KING Of" PRUSSI A PENNSYl.V ANI A 19406 JAN 131975 Memo to File f
STATUS OF PILGRIM I WITH REGARD TO RADIOACTIVE RELEASES AS OF 1/6/75 During telephone conversations on December 23, 24, and 31, 1974, with Mr. Sid Martin, Process Engineer, and on IMDry 6,1975 with R. Smith, Chemist, the following data was gathered for Pilgric I:
Caseous Releases Power Reactor Bldg.
Date Level Off-Gas (OG)
Main Stack (MS)
Vent (REV)
~ 12/24/74 82%
%200,000 uCi/sec 394 uCi/see 2100 uCi/sec 12/31/74 90%
%250,000 uCi/sec 450 uCi/sec
%3000 uCi/sec 1/2/75 85%
450,000 uCi/sec N1350 uCi/sec N3000 uC1/sec Iodinck Particulate Release (half-lives >8d.)
Reactor Bldg.
Main Stack (MS)
Vent (RBV) r
% Contri-
% Contri-bution to bution to Total %
A0G Release total TS CLjse c total TS of Total (MS Date Status Ci/sec Limit Release Limit
+ RBV) TS Limit j 11/19-11/26 Pre A0G 2.1E-7 17%
3.4E-8 56%*
73%
12/17-12/20 Post A0G 8.4E-8 140%
%140%
12/17-12/23 Post A0G 2.8E-9 0.2%
I 12/29-12/31 Post A0G
%3.0E-8
%50%**
%50%
- 4100% power
the main stack contribution was insignificant, i.e. the percentage of TS limit for iodines and particulates (t 5 > 8d) released from the facility l
(RBV + MS) % 55%.
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From the above information, the following should be noted:
1.
Despite the fact that more iodines and particulates were released from the stack than the RBV before the A0G was put into service, the major contribution to the TS limit for instantaneous release rates was from the iodines and particulates released at the RBV.
The reason for this is that the TS limit is based on site boundary concentrations; and, therefore, releases made at the stack incor-porate greater plant-to-site boundary dispersion factors than do the RBV releases. Note equation in TS 3.8.B.2.:
Qis
+
Qiv 1.24X10-6 0.061X10-6
--<1 where Qis = Ci/sce from stack and Qiv = Ci/sec from RBV l
2.
The. contribution from the RBV accounts for almost all of the TS limit for iodines and particulates since the A0G operation.
I 3.
The RBV iodine and particulate release contribution before and after the A0G operation
- appears to be the same. Note data for pre-A0G period 11/19-11/26 and post-A0G period 12/29-12/31.
4.
The nBV release rate appears to be incr, casing as a function of I
increasing off-gas releases. Compare the 12/29-12/31 RBV value j
of 50% TS limit (at 90% power and 250,000 uCi/sec 0.G. release)
I and the increased RBV value of 55% TS limit reported on January 6, 1975, for an 80% power level (after the increased OG release rate of 450,000 uCi/sec for @h. The RBV release rate was observed during the 12/16-12/19 3300 inspection to be following OG release rate for the pre-A0G period.
i Given the information that there has been no decrease in the absolute amount of RBV iodine and particulate releases or change in the upward trend of these releases as a function'of increasing OG releases since the A0G operation, it appears that:
j 1.
Pilgrim I's operations will be curtailed by the necessity to stay within the TS 3.8.B.2 limit for iodine and particulate releases as l
the OG release rate increases (which is indicative of increased i
fuel integrity loss), regardless of their A0G operation.
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- Except for 12/17-1/20 period when there were known leaks reported by R._ Smith in the sampling system unich.have since been curtailed.
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If the A0G system does develop increased leaks of iodine and particulates that are vented to the REV this will, of course, cause even greater curtailment of operations or cause Pilgrim to bypass the A0G in hopes of lowering the RBV iodine and particulate releases (assuming such a move would not violate their noble gas release rate Tech Spec linits).
3.
If the Reactor Building were vented to the stack, as is the case with Oyster Creek, the iodine and particulate release rate would presently be 2.7% of TS limits instead of their reported 55% on 1/6/75.
The essence of this memo was related verbally to Mr. G. Snyder on 1/6/75.
hv R. Hyson Radiation Specialist cc:
G. Snyder P. Knapp i
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