ML19308B280
| ML19308B280 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/02/1977 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912180985 | |
| Download: ML19308B280 (3) | |
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.ir. William 0. Parker, Jr.
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RE:. OCONEE NtCLEAf STATIO%.talITS 1,.'2 & 3.
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The NRC staff continuallyireviews;expe..rience-frem operatint, re' actors to.
assure that an adequata: level of safety:1s maintained at each individual; nuclear plant and forf the total population 'of nuclear plants. - As new technical infomation and operating experfonce becmes availablo, the.
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HP.C evaluates whether such infomation ceuld significantly alter. the previously detemined levels.of. safety. ;In this regaro, we have noted that there have been.about 50 reported water.hanner events in. light water" reactars some of, which resulted incstructural; damage.tv safety significant -
syster.s. Of theseg.approximately 20 water haneers have occurred due to the rapid condensation of. steam in feedwater lines in plants with Westinghouse and Cocibustion Engineering -designed steam generators. thile;for the most part dastage from-these ' events has been limited to piping supports, one -
event in the feedwater line.'of a pressurized water reactor aid result ins,
a significant piping failure. None of the events to date has resulted in-an adverse impact on the health and safety.of the public. It is possible, however, that water hanners could lead to more severe consequences; although it would be expected that the probabilityk~of. such events is very low.
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'T4;'-t Because of. the. c ontinui ng' eccurrence'. of. water hasseer' events,'the NRC staff _ 'g.
has been evaluating _'available..eperating emperience, actively discussing.
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with nuclear steam supply, venders and, architect / engineering firms ways of-
_ereducing -tne. frequency and: consequences of,sach," events,'and. utilizing;
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'i.4 4tachnical consultants to moraidefinitalyleWentne: water hammer phenomena
- 3; t A copy of the reportlef our'princiipal consultantvCREARELis attached
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.? Asia' result of our efforts.,te dateiwe believe that water hammers due to-i
'. the rapid condensattes'ef steam in the feedwater lines afs steamigenerators.
j represent a safety: concern. - TAccordinglyflicensees of facilities with ',
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Duke Power Company
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. Westinghouse or Combustion Engineering, design steam generators are v 7
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being requested to take further actions, including possible design'
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- sodifications, to assure an acceptably low risk to the health and.
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safety of,the public from'such events.. Tour facility is not included in this category since it utilizes B&W steam generators which haves ~
not' exhibited a propendty for water hesmers based on _ operating
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The' staff will'~ continue to monitor operating experience to assess' 3 JW the possible effects of water hemmer on the safety-of nuclear, power
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plants. While existing Technical Specifications contain reporting ~
requirements applicable-to water. hammers, the staff has developed a
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additional guidance regarding the type ~of events to -be reported.
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, Specifically, all'daeasing water; hammer events occurring in safety. -
related systeestor;eccurring. in other systems that affect safety _
related systems;.should be reporteda( A fonsat'for the reports-is.Jn
- enclosed. Damaging.. water hammer events are those events that result.
int (a) damage to ipe supports or pipe insulation, (b) pipe
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displacement,;or (c failure,of pipes or. components..
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a Approved by GA0', 8180225 '(R0072)." clearance expires July 31.-1980..
7 Approval was.given under, eLhlanket clearance specifically for identified.
generic problems.
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A. Schwencer,i Chief '
.s Operating Reactors Branch #1 f l
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Division of 0perating Reactors.:
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Report by CREARE on
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Enclosures:
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Duke Power Company SEP 0 21977 cc: Mr. William L. Porter Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 J. Michael McGarry, III Esquire DeBevoise & Liberman 700 Shoreham Building 806-15th Street, NW.,
J Washington, D.C.
20005 Oconee Public Library 201 South Spring Street Walhalla. South Carolina 29691 l
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