ML20214T954

Proposed Environ Tech Specs,Limiting Offgas in-process Activity Rate to Assure That Offsite Consequences of Seismic Failure of Augmented Offgas Sys Do Not Exceed Established Criteria

ML20214T954
Person / Time
Site:	Millstone
Issue date:	02/13/1978
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20214T944	List: ML20214T943 ML20214T954 ML20214T965
References
TAC-7355, NUDOCS 8706100496
Download: ML20214T954 (3)

Text

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l MILLSTONE NUCLEAR POWER STATION l

UNIT NOS. 1 AND 2 <

l DOCKET NOS. 50-245 AND 50-336 I

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PROPOSED ENVIRONMENTAL TECHNICAL SPECIFICATION CHANGES 8706100496 780213 P C4L, ADOCK 0S000245 PDR.

FEBRUARY ,1978

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2. For all radiciodine and radioactive materials in particulate form with half-lives greater than eight days, released to the environs as part of the gaseous wastes-7.9 x 104 Qs + 3.04 x 106 gy <,_ 1 E. Deleted 2

F. During the release of gaseous wastes from the waste gas holdup system of Unit 2, and the offgas system of Unit 1, at least one monitor in each process stream shall be operating and set to alarm and to initiate the '

automatic closure of a discharge valve prior to exceeding the limits specified in 2.4.2.2.D. above. The operability of the automatic isola-tion valve shall be demonstrated quarterly for each unit.

G. If the hydrogen concentration reaches an akrm setpoint of fo'ur percent by volume, the offgas flow through the nob'ie gas retention equipment shall be immediately terminated by closing the appropriate isolation valves and the offgas shall be sent to the stack via the 30-minute holdup pipe. Operation of the interim offgas system shall be exempted from this 7 requirement.

! H. If no stack monitor is operating, a shutdown of Unit 1 shall be initiated i

and the reactor will be in a hot shutdown condition within 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

I. The drywell of Unit 1 shall be purged through the standby gas treatment system at all times the primary containment integrity is required. 1 J. The maximum activity to be contained in one waste gas storage tank of Unit 2 shall not exceed 16,000 curies (considered as Xe-133).

K. In the Unit No.1 offgas system, the noble gas in-process activity rate shall not exceed 7.9 x 106 uCi/sec, as measured at the offgas monitor.

L. If limiting conditions in 2.4.2.2.A through 2.4.2.2.J above are exceeded, plant operations shall be modified as required to restore compliance with these specifications. Prompt reporting requirements for exceeding these limiting conditions for operation are detailed in Section 5.6.2.a.(1).

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the ENE sector at a distance of 4022 meters where the X/Q3 is 5.0 x 10-7 ')

sec/m3 for ground releases, and 1.3 x 10-8 sec/m3 for elevated releases.

The grass-goat-milk-child thyroid chain is controlling.

The assumptions used for these calculations are: (1) onsite meteorological data for the most critical 22.5 degree sector; (2) credit for building wake; and (3) a reconcentration factor of 1220 and a grazing factor of 0.5 was  ;

i applied for possible ecological chain effects from radioactive iodine and particulate releases where applicable. , )

1 Specifications 2.4.2.2.B and 2.4.2.2.C establish upper limits for the re-4 leases of noble gases, iodines and particulates with half-lives greater than i eight days, and iodine-131 at twice the design objective annual' quantity during any calendar quarter, or four times the design objective annual quantity l

during any period of 12 consecutive months. The intent of this specification

- is to permit the licensee the flexibility of operation to assure that the public is provided a dependable source of power under unusual operating condi-tions which may temporarily result in higher releases than the objectives.

In addition to the limiting conditions for operation of Specifications 2.4.2.2.B, 2.4.2.2.C, and 2.4.2.2.D, the reporting requirements of 2.4.2.2.A delineate that the cause be identified whenever the release of gaseous efflu-ents exceeds one-half the design objective annual quantity during any calendar J l

quarter, and describe the proposed program of action to reduce such release rates to the design objectives.

General Specification 2.4.2.2.F and 2.4.2.2.H are in accordance with Design Criterion 64 of 10CFR Part 50, 2

Specification 2.4.2.2.I requires that the primary containment atmosphere of Unit 1 receive treatment for the removal of gaseous iodine and particulates prior to its release.

i Specification 2.4.2.2.G and monitoring requirement 2.4.2.3.G require that hydrogen concentration in the offgas system of Unit 1 shall be monitored j at all times the recombiners are in service.

Specification 2.4.2.2.J limits the maximum offsite dose above background f I

to below the limits of 10CFR part 20, postulating that the rupture of a waste gas storage tank holding the maximum activity releases all of the-contents to the atmosphere.

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Specification 2.4.2.2.K limits the offsite dose, due to seismic failures of the Unit No.1 augmented offgas system, to 5 rem whole body. Analysis shows j l

that this of f gas limit is 2.8 x 106 uCi/sec at 30 minutes delay, using the The  !

off gas mixture defined in GE BWR Radiation Sources Document 22A2703T.

, limit stated in Specification 2.4.2.2iK is this activity rate adjusted to five minutes delay, the location of the off gas monitor.  !

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