ML17144A372: Difference between revisions

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==Dear Sir or Madam:==
==Dear Sir or Madam:==
Energy Northwest is herewith requesting the cancellation of Licensee Event Report No. 2016-005-00 submitted by referenced correspondence. Upon further evaluation of the event, Energy Northwest has concluded that neither the High Pressure Core Spray (HPCS) system nor the Primary Containment was made inoperable by the reported event. The technical bases for this assertion are as follows: (1) the magnitude of the reported leak in the HPCS Minimum Flow Line and the subsequent accumulation of water in the HPCS Room would not have impacted the capability of HPCS to fulfill any of its designated safety functions, had the system received a start signal for mitigation of an emergency during this event; and (2) the HPCS Minimum Flow return line discharge elevation in the Suppression Pool is located below Suppression Pool water level; therefore, submergence of the HPCS Minimum Flow Line discharge point would have prevented any gaseous flow from the Suppression Pool air space from reaching the location of the leaking flange. Although this condition indicated a degraded Primary Containment, the leakage did not result and would not have resulted in dose above limits or any other significant safety consequence. There are no commitments being made to the NRC by this letter. If you have any questions or require additional information, please contact Ms. D.M. Wolfgramm, Regulatory Compliance Supervisor, at (509) 377-4792.
Energy Northwest is herewith requesting the cancellation of Licensee Event Report No. 2016-005-00 submitted by referenced correspondence. Upon further evaluation of the event, Energy Northwest has concluded that neither the High Pressure Core Spray (HPCS) system nor the Primary Containment was made inoperable by the reported event. The technical bases for this assertion are as follows: (1) the magnitude of the reported leak in the HPCS Minimum Flow Line and the subsequent accumulation of water in the HPCS Room would not have impacted the capability of HPCS to fulfill any of its designated safety functions, had the system received a start signal for mitigation of an emergency during this event; and (2) the HPCS Minimum Flow return line discharge elevation in the Suppression Pool is located below Suppression Pool water level; therefore, submergence of the HPCS Minimum Flow Line discharge point would have prevented any gaseous flow from the Suppression Pool air space from reaching the location of the leaking flange. Although this condition indicated a degraded Primary Containment, the leakage did not result and would not have resulted in dose above limits or any other significant safety consequence. There are no commitments being made to the NRC by this letter. If you have any questions or require additional information, please contact Ms. D.M. Wolfgramm, Regulatory Compliance Supervisor, at (509) 377-4792.
G02-17-088 Page 2 of 2 Executed this of May, 2017 Respectfully, W. G. Hettel Vice President, Operations cc: NRC Region IV Administrator NRC NRR Project Manager NRC Sr. Resident lnspector/988C CD Sonoda-BPA/1399 WA Horin -Winston & Strawn}}
G02-17-088 Page 2 of 2 Executed this of May , 2017 Respectfully, W. G. Hettel Vice President, Operations cc: NRC Region IV Administrator NRC NRR Project Manager NRC Sr. Resident lnspector/988C CD Sonoda-BPA/1399 WA Horin -Winston & Strawn}}

Revision as of 20:29, 7 July 2018

Columbia - Cancellation of LER 16-005-00
ML17144A372
Person / Time
Site: Columbia Energy Northwest icon.png
Issue date: 05/24/2017
From: Hettel W G
Energy Northwest
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
GO2-17-088, LER 16-005-00
Download: ML17144A372 (2)
v • d • e


Text

William G. Hettel Vice President, Operations P.O. Box 968, Mail Drop PE23 Richland, WA 99352-0968 Ph. 509-377-2425 F. 509-377-4674 wghettel@energy-northwest.com May 24, 2017 GO2-17-088 10 CFR 50.73 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

Subject:

COLUMBIA GENERATING STATION, DOCKET NO. 50-397, CANCELLATION OF LICENSEE EVENT REPORT NO. 2016-005-00

Reference:

Letter GO2-17-047 from W. G. Hettel (Energy Northwest) to U.S Nuclear 50-397, Licensee Event Report No. 2016-005- 2017.

Dear Sir or Madam:

Energy Northwest is herewith requesting the cancellation of Licensee Event Report No. 2016-005-00 submitted by referenced correspondence. Upon further evaluation of the event, Energy Northwest has concluded that neither the High Pressure Core Spray (HPCS) system nor the Primary Containment was made inoperable by the reported event. The technical bases for this assertion are as follows: (1) the magnitude of the reported leak in the HPCS Minimum Flow Line and the subsequent accumulation of water in the HPCS Room would not have impacted the capability of HPCS to fulfill any of its designated safety functions, had the system received a start signal for mitigation of an emergency during this event; and (2) the HPCS Minimum Flow return line discharge elevation in the Suppression Pool is located below Suppression Pool water level; therefore, submergence of the HPCS Minimum Flow Line discharge point would have prevented any gaseous flow from the Suppression Pool air space from reaching the location of the leaking flange. Although this condition indicated a degraded Primary Containment, the leakage did not result and would not have resulted in dose above limits or any other significant safety consequence. There are no commitments being made to the NRC by this letter. If you have any questions or require additional information, please contact Ms. D.M. Wolfgramm, Regulatory Compliance Supervisor, at (509) 377-4792.

G02-17-088 Page 2 of 2 Executed this of May , 2017 Respectfully, W. G. Hettel Vice President, Operations cc: NRC Region IV Administrator NRC NRR Project Manager NRC Sr. Resident lnspector/988C CD Sonoda-BPA/1399 WA Horin -Winston & Strawn

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