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Category:NPDES NONCOMPLIANCE NOTIFICATION
MONTHYEARML20236S6601998-07-20020 July 1998 NPDES Notification of Wastewater Discharge Permit Violation: on 980623,Rancho Seco Laboratory Records Indicate Combined Plant Effluent Ph Greater than Supply Water Ph.Caused by Improper Reporting of Ph Values.Reviewing Existing Methods ML20249B9021998-06-18018 June 1998 NPDES Noncompliance Notification:On 980603,release of Small Amount of Low Ph Water from Plant.Caused by acid-water Solution Being Spilled Into Sump.Operator re-diverted Plant Wastewater Discharge & Flushed Outlet Ph Monitor'S Probe 1998-07-20
[Table view] Category:TEXT-ENVIRONMENTAL REPORTS
MONTHYEARML20207D4651998-12-31031 December 1998 Annual Radioactive Effluent Release Rept for Period Jan-Dec 1998, for Rancho Seco Nuclear Generating Station ML20204E6761998-12-31031 December 1998 1998 Annual Exposure Rept ML20205A1691998-12-31031 December 1998 Annual Radiological Environmental Operating Rept, for Jan- Dec 1998,for Rancho Seco Nuclear Station.With ML20236S6601998-07-20020 July 1998 NPDES Notification of Wastewater Discharge Permit Violation: on 980623,Rancho Seco Laboratory Records Indicate Combined Plant Effluent Ph Greater than Supply Water Ph.Caused by Improper Reporting of Ph Values.Reviewing Existing Methods ML20249B9021998-06-18018 June 1998 NPDES Noncompliance Notification:On 980603,release of Small Amount of Low Ph Water from Plant.Caused by acid-water Solution Being Spilled Into Sump.Operator re-diverted Plant Wastewater Discharge & Flushed Outlet Ph Monitor'S Probe ML20217G8531998-03-31031 March 1998 NPDES Discharger Self Monitoring Rept ML20217G6821998-02-28028 February 1998 Discharger Self Monitoring Rept for Feb 1998 ML20203H7131997-12-31031 December 1997 Annual Radioactive Effluent Release Rept ML20217H0491997-12-31031 December 1997 Reg Guide 1.16,1997 Annual Exposure Rept ML20216G8041997-12-31031 December 1997 Annual Radiological Environ Operating Rept,Jan-Dec 1997 for Rancho Seco Nuclear Station ML20135D9041996-12-31031 December 1996 Annual Radioactive Effluent Release Rept Jan-Dec 1996 ML20137D1081996-12-31031 December 1996 Reg Guide 1.16,1996 Annual Exposure Rept ML20137Y3411996-12-31031 December 1996 Annual Radiological Environ Operating Rept for Period Jan-Dec 1996 ML20058D6751993-11-12012 November 1993 Environmental Assessment & Fonsi in Consideration of Issuance of Exemption from Requirements of 10CFR140.11(a)(4) to License DPR-54 ML20057A3291993-09-0202 September 1993 Environmental Assessment & Fonsi Re Exemption from Training Program Establishment,Implementation & Maint Requirements of 10CFR50.120.NRC Considering Exemption ML20056G6711993-06-30030 June 1993 Semiannual Radioactive Effluent Release Rept Jan-June 1993 ML20056B4671990-08-22022 August 1990 Environ Assessment & Finding of No Significant Impact Supporting Proposed Exemption to 10CFR50.47 & 10CFR50,App E ML20059E0091990-06-30030 June 1990 Semiannual Radioactive Effluent Release Rept,Jan-June 1990 ML20059E0281989-12-31031 December 1989 Addendum to, Semiannual Radioactive Effluent Release Rept, Jul-Dec 1989 ML20059E0311989-06-30030 June 1989 Addendum to, Semiannual Radioactive Effluent Release Rept, Jan-June 1989 ML20246M1401989-06-30030 June 1989 Semiannual Radioactive Effluent Release Rept Jan-June 1989 ML20246B1041989-06-13013 June 1989 Environ Assessment & Finding of No Significant Impact Supporting Issuance of Exemption from 10CFR20,App A,Footnote d-2(c) Requirements ML20245A0821989-05-31031 May 1989 Discharger Self Monitoring Rept,May 1989 ML20247F1221989-04-30030 April 1989 NPDES Discharger Self-Monitoring Rept for Apr 1989. Water Quality Violations Noted Re High Total Coliform Results & High Biological Oxygen Demand ML20247D0761989-03-23023 March 1989 Environ Assessment & Finding of No Significant Impact Re Exemption from Requirements of 10CFR50,App J ML20248J5701989-02-28028 February 1989 Discharger Self Monitoring Rept for Feb 1989 ML20235U7841988-12-31031 December 1988 Semiannual Radioactive Effluent Release Rept,Jul-Dec 1988 ML20248J6081988-12-31031 December 1988 1988 Annual Exposure Rept ML20059E0351988-12-31031 December 1988 Addendum to, Semiannual Radioactive Effluent Release Rept, Jul-Dec 1988 ML20154P1241988-09-26026 September 1988 Environ Assessment & Finding of No Significant Impact Re Exemption from 10CFR50.54(w)(5)(i) Requirements Concerning Increase in Amount of Onsite Property Damage Insurance Required to Be Carried by Licensees ML20207H9101988-07-31031 July 1988 Discharger self-monitoring Rept for Jul 1988 ML20154J3271988-06-30030 June 1988 Semiannual Radioactive Effluent Release Rept,Jan-June 1988,Rancho Seco Nuclear Generating Station ML20196K3021988-05-31031 May 1988 NPDES Discharge Monitoring Rept for May 1988 ML20151V7541988-03-31031 March 1988 Discharger Self Monitoring Rept, for Mar 1988 ML20148N1281988-02-29029 February 1988 Discharger Self Monitoring Rept for Feb 1988 ML20155J7061987-12-31031 December 1987 Semiannual Radioactive Effluent Release Rept,Jul-Dec 1987 ML20195J0571987-12-31031 December 1987 Annual Radiological Environ Operating Rept,1987 ML20237K8251987-06-30030 June 1987 Semiannual Radioactive Effluent Release Rept,Jan-June 1987 ML20215K5921987-06-17017 June 1987 Environ Assessment & Finding of No Significant Impact Supporting Requests for Exemptions from 10CFR50,App R Requirements Re Fire Protection Program ML20235C9281987-05-31031 May 1987 Discharger Self Monitoring Rept for May 1987 ML20215B5831987-04-30030 April 1987 Discharger Self Monitoring Rept for Apr 1987 ML20207R6561987-02-28028 February 1987 Discharger Self-Monitoring Rept for Feb 1987 ML20210U1511987-01-31031 January 1987 Discharger Self-Monitoring Rept for Jan 1987 ML20215L4241986-12-31031 December 1986 Annual Radiological Environ Operating Rept 1986 ML20207P9771986-12-31031 December 1986 Discharger Self-Monitoring Rept for Dec 1986 ML20213F9481986-10-31031 October 1986 Discharger self-monitoring Rept for Oct 1986 ML20215G4821986-09-30030 September 1986 Discharger Self Monitoring Rept, for Sept 1986 ML20214P5851986-08-31031 August 1986 Discharger Self-Monitoring Rept for Aug 1986 ML20205D8311986-07-31031 July 1986 Discharger self-monitoring Rept for Jul 1986 ML20207D4971986-06-30030 June 1986 Discharger self-monitoring Rept for June 1986 1998-07-20
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J )SidUD SACRAMENTO MUNICIPAL UTluTY DISTRICT O 6201 S Street, P.o. Box 15830, Sacramento CA 95852 1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CAllFORNIA MPC&D 98-119 -
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U. S. Nuclear Regulatory Commission Attn: E. W. Merschoff, Regional Administrator Region IV Parkway Central Plaza Building 611 Ryan Plaza Building, Suite 400 Arlington, Texas 76011-4085 Docket No. 50-312 Rancho Seco Nuclear Station License No. DPR-54 REPORT OF COMBINED PLANT EFFLUENT pli GREATER THAN Tile SUPPLY WATER pH; NPDES PERMIT NUMBER CA0004758
Dear Mr. Merschoff:
In accordance with a condition specified in the NRC Safety Evaluation Report for License Amendment No. 45 to Facility Operating License No. DPR-54, the District is required to notify j the NRC concerning Rancho Seco NPDES wastewater discharge perrnit violations. Below, the District provides information the Rancho Seco combined plant effluent pH being reported as greater than the supply water pH, which was reported as greater than 8.5.
In accordance with NPDES Permit No. CA0004758, the combined plant effluent pH may be greater than 8.5, if the supply water pH is equal to or greater than the combined plant effluent pH. -
g The permit allows this because the Rancho Seco combined plant effluent is approximately 99.99%
supply water. For June 23,1998, Rancho Seco laboratory records indicate the combined plant effluent pH was 9.01 while the supply water pH was 8.78. This constitutes a NPDES permit j violation since the combined plant effluent pH was reported as both greater than the supply water pH and greater than 8.5.
The District investigated the reported high pH value to try to determine if a release of a caustic element caused the reported pH values. The District could find no evidence that a caustic j element scenario occurred. The District believes laboratory personnel improperly reported the l pH values and that the reported values are analytical errors.
I I
9807270153 900720 #
PDR ADOCK 05000312 S pop is-1s29 RANCHO SECO NUCLEAR GENERATING STATION D 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333-2935
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Mr. Merschoff MPC&D 98-119 Existing administrative controls are designed to identify analytical errors through resample to invalidate or confirm initial, suspect results. Unfortunately, the District did not identify this l potential NPDES violation situation until June 25,1998. The District took both a combined j plant effluent and supply water sample on June 25,1998, and confirmed the proper pH -
- l. relationship (i.e., supply water pH > combined plant effluent pH > 8.5).
. Rancho Seco laboratory personnel are performing a review of the existing analytical methods and
' administrative controls for pH analyses. The District's objective is to implement appropriate
[. corrective actions that provide assurance the analytical errors experienced on June 23,1998, will -
i not be repeated.
L I Members of your staff mquiring additional information or clarification may contact Mr. Richard l- Mannheimer at (916) 452-3211, Extension 4916.
l l Sincerely i
h&
n Steve J. Redeker Manager Plant Closure and Decommissioning cc: V.Everett,NRC, Arlington, Texas l-i I
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