ML19317E088
| ML19317E088 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Mcguire, McGuire, 05000360  |
| Issue date: | 11/28/1977 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912130746 | |
| Download: ML19317E088 (1) | |
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.j NUCLEAR ftEGULATORY COMMISSION 3.,
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230 PE AOHT RE E STR E ET. N.W. SusTE 1217 c%4,
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NOV i f 1977 c9 N 7
In Reply Refer To:
RII:JPO 50-369, 50-370 50-269, 50-270 /
i 50-287 Duke Power Company l
Attn:
Mr. William O. Parker, Jr.
Vice President, Steam Production P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
j The enclosed IE Circular 77-14 is forwarded to you for information.
No l
written response is required.
Should you have any questions related to l
your understanding of this matter, please contact this offlee.
Sincerely, James P. O'Re 11y Director
Enclosures:
- 2. List of IE Circulars Issued in 1977 cc:
J. C. Rogers, Proj ect Manager l
McGuire Nuclear Station l
P. O. Box 2178 Charlotte, North Carolina 28242
{
M. D. McIntosh, Plant Manager McGuire Nuclear Station f
l P. O. Box 488 Cornelius, North Carolina 28031 i
!? k J. E. Smith, Station Manager Oconee Nuclear Station P. O. Box 1175 7912130 Seneca, South Carolina 29678
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NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 November 28, 1977 IE Circular No. 77-14 SEPARATION OF CONTAMINATED WATER SYSTEMS FROM NON-CONTAMINATED PLANT SYSTEM THIS CIRCUIAR DESCRIBES AN EVENT WHICH OCCURRED AT A NUCLEAR POWER FACILITY: HOWEVER, THE GENERIC IMPLICATIONS MAY BE APPLICABLE TO TEST REACTORS FUEL CYCLE FACILITIES, AND MAJOR BY-PRODUCT MATERIAL PROCESSORS.
In June, 1977, the licensee for Beaver Valley I reported that make up water from a primary water storage tank (PWST) contaminated the plant water treatment system, which in turn supplies the in-plant domestic (potable) water system.
The plant domestic water became contaminated with a tritium concentration of 7xE(-3) uCi/ml.
The domestic water was contaminated for approximately six hours before the condition was detected by the licensee and controls were established over the use of in-house water.
No significant exposure of plant personnel resulted from the event; however, five individuals showed positive levels of tritium by urinalysis.
No release to the offsite environment above maximum permissible occurred.
f The PWST receives processed reactor coolant water from the Joron Recovery System which has been purified through evaporation, degasi-fication and demineralization to remove, radioisotopes other than tritium.
The PWST is used to supply primary grade water to the reactor coolant system and is normally kept separated from the water treatment system.
The cross connection between the primary grade water system and the water treatment system occurred when an isolation valve was inadvertently left open during valve line-up operations to recirculate the PWST.
The procedure which specified the required line-up was being used for the first time since preoperational testing and i
did not list the subject valve.
In addition to the valving error, however, a design error resulted in connecting a line from the PWST to a water treatment system line l
at a position upstream of two series stop-check valves.
In the proper configuration, the line would have been connected downstream of the stop-check valves, which would have prevented back flow of water f rom the primary grade water system to the water treatement system even with the isolation valve left open.
Corrective actions taken 1 of
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IE Circular No. 77-14 November 28, 1977 1
LISTING OF IE CIRCULARS ISSUED IN 1977 CIRCULAR SUBJECT FIRST DATE OF ISSUED TO NO.
ISSUE 77-01 Malfunctions of 1-4-77 All holders of Limitorque Valve Operating License Operators (OL) or Construc-tion permit (CP) 77-02 Potential Heavy 2-15-77 All affected Spring Flooding holders of OLs77-02A Potential Heavy 2-16-77 All affected Spring Flooding holders of cps 77-03 Fire Inside 2-28-77 All holders of a Motor Control OLs and cps Center 7-04 Inadequate Lock 3-17-77 Safeguard Grcup Assemblies I, II, IV, V, Licensees 77-05 Liquid Entrapment 3-24-77 All holders of in Valve Bonnets OLs and cps 77-06 Effects of Hydraulic 4-1-77 All holders of Fluid on Electrical OL's and cps Cable i
7-07 Short Period During 4-12-77 Holders of Reactor Startup BWR OLs l
7-08 Failure of Feedwater 4-13-77 All holders l
Sample Probe of OLs l
77-09 Improper Fuse 5-25-77 All holders of Coordination In BWR BWR OLs or cps Standby Liquid Control l
System Control Circuits 7-10 Vacuum Conditions 7-15-77 All holders of Resulting in Damage to GLs
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4 IE Circular No. 77-14 November 28, 1977 LISTING OF IE CIRCULARS ISSUED IN 1977 (Continued)
CIRCULAR SUBJECT FIRST DATE OF ISSUED TO NO.
ISSUE 77-11 Leakage of Con-9-6-77 All holders of OLs tainment Isolation and cps Valves with Resilient Seats 7-12 Dropped Fuel Assem-9-15-77 All holders of SWR blies at BWR Facili-OLs or cps ties 77-13 Reactor Safety Signals 9-22-77 All holders of OLs Negated During Testing and cps l
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