05000245/LER-1997-005, :on 970115,discovered That Radwaste Storage Bldg Vent Exhaust Fan HVE-14 Discharges Directly to Atmosphere.Caused by Inadequate Design Review.Operation of Exhaust Fan HVE-14 Was Prevented Immediately

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:on 970115,discovered That Radwaste Storage Bldg Vent Exhaust Fan HVE-14 Discharges Directly to Atmosphere.Caused by Inadequate Design Review.Operation of Exhaust Fan HVE-14 Was Prevented Immediately
ML20138G437
Person / Time
Site: Millstone Dominion icon.png
Issue date: 04/30/1997
From: Robert Walpole
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20138G425 List:
References
LER-97-005, LER-97-5, NUDOCS 9705060297
Download: ML20138G437 (3)
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LER-1997-005, on 970115,discovered That Radwaste Storage Bldg Vent Exhaust Fan HVE-14 Discharges Directly to Atmosphere.Caused by Inadequate Design Review.Operation of Exhaust Fan HVE-14 Was Prevented Immediately
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(viii)
10 CFR 50.73(a)(2)(iii)
10 CFR 50.73(a)(2)(v), Loss of Safety Function
10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
2451997005R00 - NRC Website
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text

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' NRC FORM 356 U.S. NUCLEAR REGULATORY COMMISSION CPPROVED SY OMB NO. 316o-01o4 EXPIRES 04/30/98 (4-95)

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F ACILITY NAME (1)

DOCKET NUMBER (2)

PAGE13)

Millstone Nuclear Power Station Unit 1 05000245 1 of 3 TriLE I4)

Radwaste Storage Building Exhaust Fan Discharges to Atmosphere Without Radiation Monitoring

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EVENT DATE (5)

LER NUMBER (6)

REPORT DATE (7)

OTHER FACILITIES INVOLVED (8) j MONTH DAY YEAR YEAR SEQUENTIAL REVISION MONTH DAY YEAR FActuTY NAME DOCKET NUMBER NUMBER

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01 15 97 97 005 01 04 30 97 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR 5: (Check one or more) (11)

ODE m N

20.2201(b) 20.2203(a)(2)(v) so.73(a)(2)(i) 50.73(a)(2)(viii)

LEVEL (101 000 20.2203(a)(3)(i)

X so.73(a)(2)(ii)

So.73(a>(2>(x) l POWER 20.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(3)(ii) 50.73(a)(2)(iii) 73.71 20.2203(a)(2)(ii) 20.2203(a)(4)

So.73(a)(2)(iv)

OTHER 20.2203(a)(2)(iii)

So.36(c)(1) 50.73(a)(2)(v)

Specify in Abstract below or in NRC Form 366A l

s 20.2203(a)(2)(iv)

So.36(c)(2)

So.73(a)(2)(vii)

LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER Unclude Area Codel Robert W. Walpole, MP1 Nuclear Licensing Manager (860)440-2191 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

CAUSE

SYSTEM COMPONENT MANUFACTURER REPORTABLE

CAUSE

SYSTEM COMPONENT MANUFACTURER REPORTABLE TO NPRDs To NPRDS V

i SUPPLEMENTAL REPORT EXPECTED (14)

EXPECTED MONTH DAY YEAR SUBMISSION g NO YES (if yes, complete EXPECTED SUBMISSION DATE).

ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines) (16)

On January 15, 1997, with the plant in the COLD SHUTDOWN condition, it was discovered that the Radwaste Storage Building (RSB) vent exhaust fan HVE-14 discharges directly to the atmosphere without continuous radiation monitoring. On February 6,1997, this event was determined to be reportable and a report was made pursuant to 10CFR50.72(b)(1)(ii)(B) as a condition that is outside of the design basis of the plant. The HEPA filter for the exhaust fan has not been tested to verify the efficiency of the filter. The airborne activity in the RSB was exhausted directly without an operable HEPA filter.

Operation of exhaust fan HVE-14 was prevented immediately upon discovery of the event. A review of a sample of the Health Physics airborne radioactivity surveys for the RSB has determined that there was no significant unmonitored release based on the low levels of airborne activity in the RSB. Prior to returning HVE-14 to service, the HEPA filter will be tested and a program for periodic testing of the filter will be established. The Design Change i

Manual will be reviewed to verify adequate desig.1 change controls for HVAC systems.

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'NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (4-95) i LICENSEE EVENT REPORT (LER) j TEXT CONTINUATION FACILITY NAME (1)

DOCKET NUMBER (2)

LER NUMBER (6)

PAGE (3)

YEAR SEQUENTIAL REVISION i

Millstone Nuclear Power Station Unit 1 05000245 NUMBER NUMBER 2 of 3 i

i 97 005 01 TEXT (If more space is required, use additional copies of NRC Form 366A) (17) i 1.

Description of Event

On January 15,1997, with the plant in the COLD SHUTDOWN condition, it was discovered that the RSB vent exhaust fan HVE-14 discharges directly to the atmosphere without continuous radiation monitoring, j

The Radiological Environmental Review (RER) for the design change which installed HVE-14 required the

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use of a HEPA filter. The RER specified the low level of activity inside the RSB and the high removal efficiency of the HEPA filter as the bases for not requiring a permanently installed monitoring system. The j

requirements for HEPA filter testing to verify removal efficiency were not initiated. The evaluation of this j

event is reportable pursuant to 10CFR50.72(b)(1)(ii)(B) as a condition that is outside cf the design basis of the plant.

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i i

i ll. Cause of Event 4

l The cause of this event was inadequate design review and turnover process. The design change process vid not implement the RER requirements for this system.

Ill. Analysis of Event Fan HVE-14 draws air from the decontamination facility, compactor room, and loading bay of the RSB.

This fan exhausts the air to the atmosphere through an unmonitored roof duct. By design the air exhausted from the RSB was to be filtered through a HEPA filter with a DOP tested efficiency of 99.75% as described in Regulatory Guide 1.140. The air in the RSB was assumed to be filtered with an efficiency of 99% to further reduce the level of activity released to the environment. The RER indicated that sampling of the air down stream of the HEPA filter could be performed, however, the level of activity would be too low to be detected. Although sampling downstream of the HEPA filter has never been performed, a review of the routine air samples in the RSB has confirmed the low levels of airborne radioactivity, therefore, no significant release occurred.

This event is reportable pursuant to 10CFR50.73(a)(2)(ii)(B) as a ' condition that was outside of the design basis of the plant. The exhausting of unmonitored air through HVE-14 without a qualified HEPA filter is a g

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violation of 10CFR20 in that RSB air samples do not provide a survey of radioactive materials in effluents.

IV. Corrective Action

Operation of exhaust fan HVE-14 was prevented immediately upon discovery of the event.

e Prior to returning HVE-14 to service, the HEPA filter will be tested and a program for periodic testing will be established.

The Design Change Manual will be reviewed to verify adequate design change controls for HVAC systems.

V.

Additional Information

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'NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION I4-95)

UCENSEE EVENT REPORT (LER)

TEXT CONTINUATION FACILITY NAME (1)

DOCKET NUMBER (2)

LER NUMBER (6)

PAGE (3)

YEAR SEQUENTIAL REVISION Millstone Nuclear Power Station Unit 1 05000245 NUMBER NUMBER 3 of 3 97 005 01 TEXT fit more space is required, use additional copies of NRC Form 366A) (17)

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