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* 1 N epCO VIRGINI A ELECTRIC AND POWER COMP ANY, RICHMOND, VIRGINI A 23261 March 2, 1979 Mr. -James P. O'Reilly. Director'' | * 1 N epCO VIRGINI A ELECTRIC AND POWER COMP ANY, RICHMOND, VIRGINI A 23261 March 2, 1979 Mr. -James P. O'Reilly. Director'' | ||
Serial No. 061A | Serial No. 061A | ||
-.0ffice Inspection & Enforcement PSESC/JMD:adw:mc. | -.0ffice Inspection & Enforcement PSESC/JMD:adw:mc. | ||
U. S. Nuclear Regulatory Comission | U. S. Nuclear Regulatory Comission | ||
- Aegion II - | - Aegion II - | ||
; Docket No. 50-339. | ; Docket No. 50-339. | ||
Line 37: | Line 28: | ||
==Dear,== | ==Dear,== | ||
Mr. 0'Reilly: | Mr. 0'Reilly: | ||
_Undertheprovisionsof10CFR50.55(e),NRCRegionIIwasnotifiedon | _Undertheprovisionsof10CFR50.55(e),NRCRegionIIwasnotifiedon | ||
> ~ January 31. 1979 concerning the lack of seismic supports and missle pro-i tection for.the' Unit 2 diesel generator mufflers. Following a field in- | > ~ January 31. 1979 concerning the lack of seismic supports and missle pro-i tection for.the' Unit 2 diesel generator mufflers. Following a field in- | ||
Line 47: | Line 37: | ||
3 Each diesel's exhaust will be aligned to discharge from a seismically | 3 Each diesel's exhaust will be aligned to discharge from a seismically | ||
, supported unauffled exhaust line in addition' to the existing muffled exhaust | , supported unauffled exhaust line in addition' to the existing muffled exhaust | ||
! arrangement. . - A flexible self-detaching fabric connector will be incorp- | ! arrangement. . - A flexible self-detaching fabric connector will be incorp-orated in the exposed portion of each muffled exhaust line, downstream of i each exhaust line service building penetration. The flexible connectors will prevent potentially damaging muffled exhaust line movements, introduced from external sources, from being transmitted back to the associated unauffled ex- | ||
orated in the exposed portion of each muffled exhaust line, downstream of i each exhaust line service building penetration. The flexible connectors will prevent potentially damaging muffled exhaust line movements, introduced from external sources, from being transmitted back to the associated unauffled ex- | |||
: . haust line within the building structure. Operating the diesels in this ven- | : . haust line within the building structure. Operating the diesels in this ven- | ||
! dor approved manner presents no operational or reliability problems. Existing | ! dor approved manner presents no operational or reliability problems. Existing | ||
Line 57: | Line 45: | ||
, , pitch operating drone of.the diesels during periodic operations, the unmuffled exhaust lines will be secured via manually operated high temperature valves. . | , , pitch operating drone of.the diesels during periodic operations, the unmuffled exhaust lines will be secured via manually operated high temperature valves. . | ||
- . The modifications.to the' Unit 2 diesel exhaust lines will be completed | - . The modifications.to the' Unit 2 diesel exhaust lines will be completed | ||
! prior to fuel load. Pending the receipt of the isolation vsives, the~ un- | ! prior to fuel load. Pending the receipt of the isolation vsives, the~ un-muffled branches will. be blanked off. Should delivery of the isolation valves l be delayed beyond fuel load, portions of.the exposed muffled exhaust pipes, downstream of-the building penetrations, will be removed providing temporary | ||
. unmuffled exhaust paths. Eliminating portions of the exhaust system, exposed to possible damage and/or occulsion, ensures the diesels availability for j service.. | |||
muffled branches will. be blanked off. Should delivery of the isolation valves l be delayed beyond fuel load, portions of.the exposed muffled exhaust pipes, downstream of-the building penetrations, will be removed providing temporary | |||
. unmuffled exhaust paths. Eliminating portions of the exhaust system, exposed | |||
to possible damage and/or occulsion, ensures the diesels availability for j service.. | |||
i 79030604(of g L- _ --- _ | i 79030604(of g L- _ --- _ | ||
v . | v . | ||
.. . 1 - | .. . 1 - | ||
. Mr. James P. O'Reilly, Director | . Mr. James P. O'Reilly, Director | ||
:2-4 , | |||
:2- | |||
4 , | |||
v - | v - | ||
' This submitta1Lshall be considered'a final report under the provisions of 10CFR50.55(e).. Should you require further information, pleasa. contact this | ' This submitta1Lshall be considered'a final report under the provisions of 10CFR50.55(e).. Should you require further information, pleasa. contact this | ||
-office. - , | -office. - , | ||
- /. , , ifj p urs, | - /. , , ifj p urs, lPVytr1!, - | ||
lPVytr1!, - | |||
.l . | .l . | ||
[ Sam l g) C. Br)own, Jr.%# | [ Sam l g) C. Br)own, Jr.%# | ||
. Senior Vice President Poymr Station Engineering ~and C nstruction j | |||
. Senior Vice President Poymr Station Engineering ~and C nstruction | |||
j | |||
- cc: ffr. -John G. Davis. . Acting Director Office of Inspection & Enforcement Mr. Harold R. Denton, Director- ' | - cc: ffr. -John G. Davis. . Acting Director Office of Inspection & Enforcement Mr. Harold R. Denton, Director- ' | ||
, Office of Nuclear Reactor. Regulation | , Office of Nuclear Reactor. Regulation | ||
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,}} | ,}} |
Latest revision as of 03:35, 22 February 2020
ML19282A763 | |
Person / Time | |
---|---|
Site: | North Anna |
Issue date: | 03/02/1979 |
From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
References | |
061A, 61A, NUDOCS 7903060465 | |
Download: ML19282A763 (2) | |
Text
. . . . .
\
- 1 N epCO VIRGINI A ELECTRIC AND POWER COMP ANY, RICHMOND, VIRGINI A 23261 March 2, 1979 Mr. -James P. O'Reilly. Director
Serial No. 061A
-.0ffice Inspection & Enforcement PSESC/JMD:adw:mc.
U. S. Nuclear Regulatory Comission
- Aegion II -
- Docket No. 50-339.
- '101 Marietta Street, Suite'3100 Atlanta, Georgia 30303
Dear,
Mr. 0'Reilly:
_Undertheprovisionsof10CFR50.55(e),NRCRegionIIwasnotifiedon
> ~ January 31. 1979 concerning the lack of seismic supports and missle pro-i tection for.the' Unit 2 diesel generator mufflers. Following a field in-
! spection of the exhaust mufflers our personnel determined the mufflers-seismic support plates-had been omitted..
Following an engineering evaluation in conjunction with the diesel gen-erator manufacturers muffler loading recommendations, it has been detemined
! that subjecting the mufflers to seismic or tornado wind loadings may over-stress the roof support attachments. In addition, should a failure of a muffler or the associated exhaust piping located on the roof, cause a block-i age of the exhaust gases, the diesels operation-could be adversely affected.
- Corrective actions for cach diesel have been initiated to modify the j current exhaust systems. Each exhaust line will be modified to provide a
- parallel exhaust path, originating within the service building structure.
3 Each diesel's exhaust will be aligned to discharge from a seismically
, supported unauffled exhaust line in addition' to the existing muffled exhaust
! arrangement. . - A flexible self-detaching fabric connector will be incorp-orated in the exposed portion of each muffled exhaust line, downstream of i each exhaust line service building penetration. The flexible connectors will prevent potentially damaging muffled exhaust line movements, introduced from external sources, from being transmitted back to the associated unauffled ex-
- . haust line within the building structure. Operating the diesels in this ven-
! dor approved manner presents no operational or reliability problems. Existing
'i ,
roof structures will be modified to provide the necessary seismic and missle
! protection for the new unauffled exhaust piping. In order to reduce the low-
, , pitch operating drone of.the diesels during periodic operations, the unmuffled exhaust lines will be secured via manually operated high temperature valves. .
- . The modifications.to the' Unit 2 diesel exhaust lines will be completed
! prior to fuel load. Pending the receipt of the isolation vsives, the~ un-muffled branches will. be blanked off. Should delivery of the isolation valves l be delayed beyond fuel load, portions of.the exposed muffled exhaust pipes, downstream of-the building penetrations, will be removed providing temporary
. unmuffled exhaust paths. Eliminating portions of the exhaust system, exposed to possible damage and/or occulsion, ensures the diesels availability for j service..
i 79030604(of g L- _ --- _
v .
.. . 1 -
. Mr. James P. O'Reilly, Director
- 2-4 ,
v -
' This submitta1Lshall be considered'a final report under the provisions of 10CFR50.55(e).. Should you require further information, pleasa. contact this
-office. - ,
- /. , , ifj p urs, lPVytr1!, -
.l .
[ Sam l g) C. Br)own, Jr.%#
. Senior Vice President Poymr Station Engineering ~and C nstruction j
- cc: ffr. -John G. Davis. . Acting Director Office of Inspection & Enforcement Mr. Harold R. Denton, Director- '
, Office of Nuclear Reactor. Regulation
~> .
4 g*
k: l '
- 4 i 4 p ,7
+ .- i4
. [}. .
3
] d t
t
- I 4
y '5 p
/ '
. t y.
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