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{{#Wiki_filter:IMARIM/2#14                                                                                                            P*O  1
(/l/04US.                Nuclear Regulatorv Conmmission On erationn. Center Event Reonrt                    Paa e I Power Reactor                                                                                    Event #      50166 Site: WATTS BAR                                  Notification Date I Time: 06/03/2014      14:15  (EDT)
Unit:    2        Region: 2        State: TN        Event Date I Time: 06/03/2014              (EDT)
Reactor Type: [1] W-4-LP,[2] W-4-LP                                Last Modification: 06/03/2014 Containment Type: ICE COND NRC Notified by: JIM O'DELL                                      Notifications: SCOTT FREEMAN                  R2DO HQ Ops Officer: CHARLES TEAL                                                      OMID TABABAI                NRO Emergency Class: NON EMERGENCY                                                      PART 21/50.55 GROUP          EMAIL 10 CFR Section:
50.55(e)              CONSTRUCT DEFICIENCY Unit -Scram Code      RX Crit Init Power    Initial RX Mode              Curr Power  Current RX Mode 2          N            No  0            Under Construction            0            Under Construction WATTS BAR UNIT 2 POTENTIALLY DEFECTIVE FUSES INSTALLED "WBN [Watts Bar Nuclear] Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN [Sequoyah] Units 1 or 2, or BFN [Browns Ferry Nuclear] Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e)."
The licensee has notified the NRC Resident Inspector.
NRC FORM 361                                                                                                                      U.S. NUCLEAR REGULATORY COMMISSION (12-2000)                                                                                                                                        OPERATIONS CENTER REACTOR PLANT EVENT NOTIFICATION WORKSHEET                                                                        EN #
NRC OPERATION TELEPHONE NUMBER: PRIMARY -- 301-816-5100 or 800-532-3469*, BACKUPS -- [1st] 301-951-0550 or 800-449-3694*,
[2nd] 301-415-0550 and [3rd] 301-415-0553                                                      *Licensees who maintain their own ETS are provided these telephone numbers.
NOTIFICATION TIME          FACILITY OR ORGANIZATION                            UNIT              NAME OF CALLER                                      CALL BACK #
          -------- Watts Bar Nuclear Plant                                      2                Jim O'Dell                                                      See below.
EVENT TIME & ZONE          EVENT DATE                      POWER/MODE BEFORE                                                POWER/MODE AFTER N/A                              4/30/2014                N/A                                                              N/A EVENT CLASSIFICATIONS                                1-Hr. Non-Emergency 10 CFR 50.72(b)(1)                      [: (v)(A)    Safe S/D Capability                  AINA E]  GENERAL EMERGENCY                      GEN/AAEC        0[            TS Deviation                            ADEV E] (v)(B)        RHR Capability                      AINB
[] SITE AREA EMERGENCY                      SIT/AAEC          4-Hr. Non-Emergency 10 CFR 50.72(b)(2)                      []  (v)(C)  Control of Rad Release              AINC El  ALERT                                  ALE/AAEC        El  (i)      TS Required S/D                          ASHU    El  (v)(D)  Accident Mitigation                  AIND
[l UNUSUAL EVENT                          UNU/AAEC        []  (iv)(A)  ECCS Discharge to RCS                    ACCS    [j (xii)      Offsite Medical                    AMED E  50.72 NON-EMERGENCY            (see next columns)          (iv)(B)  RPS Actuation (scram)                    ARPS    El  (xiii)  Loss Comm/Asmt/Resp                ACOM El  PHYSICAL SECURITY (73.71)                    DDDD            (xi)      Offsite Notification                    APRE            60-Day Optional 10 CFR 50.73(a)(1)
E  MATERIAL/EXPOSURE                              B???        8-Hr. Non-Emergency 10 CFR 50.72(b)(3)                      El            Invalid Specified System Actuation  AINV E  FITNESS FOR DUTY                                HFIT    El [(ii)(A)    Degraded Condition                      ADEG      Other Unspecified Requirement (Identify)
El  OTHER UNSPECIFIED REQMT. (see last column)              El  (ii)(B)  Unanalyzed Condition                    AUNA    2[ 10CFR50.55(e)                                  NONR El  INFORMATION ONLY                              NINF    E]l  (iv)(A)  Specified System Actuation              AESF                                    ,1              NONR DESCRIPTION Include: Systems affected, actuations and their initiating signals, causes, effect of event on plant, actions taken or planned, etc. (Continue on back)
WBN Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse Letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN Units 1 or 2, or BFN Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e).
Licensing Contacts:
Jim Odell (423) 365-3818 Gordon Arent (423) 365-2004 Tom Metzler (423) 365-7754 Technical
==Contact:==
Steve Hilmes (423) 365-3286 NOTIFICATIONS                      YES      NO        WILL BE        ANYTHING UNUSUAL OR                      YES (Explain above)                NO NRC RESIDENT                        2        El            El          NOT UNDERSTOOD?
STATE(s)                            El E_                    []El        DID ALL SYSTEMS                          YES                                NO (Explain above)
LOCAL                                [        []            El          FUNCTION AS REQUIRED?                    YE OTHER GOV AGENCIES                                          OEl        MODE OF OPERATION UNOE COFPERATIN ESTIMATED RESTART DATE:        N/A          ADDITIONAL INFO ON BACK MEDIA/PRESS RELEASE                  El      [            El        UNTIL CORRECTED2          N/A      (MM/DD/YYYY)                        []  YES                NO NRC FORM 361 (12-2000)                                                                                                                                                PAGE I OF 2
NRC FORM 361                                                      REACTOR PLANT (12-2000)
EVENT NOTIFICATION WORKSHEET (CONTINUED)
ADDITIONAL INFORMATION RADIOLOGICAL RELEASES: CHECK OR FILL IN APPLICABLE ITEMS (specific details/exelanationsshould be covered in event description)
II    LIQUID RELEASE JEIZGASEOUS RELEASE F- UNPLANNED RELEASE D--I                      PLANNED RELEASE El ONGOING                    [--I TERMINATED
[] MONITORED              ILIIUNMONITORED            [  OFFSITE RELEASE          lizi  T. S. EXCEEDED      1w  RM ALARMS            I IAREAS EVACUATED PERSONNEL EXPOSED OR CONTAMINATED                LI OFFSITE PROTECTIVE ACTIONS RECOMMENDED                  *State release path in description Release Rate (Cilsec)      % T. S. LIMIT    HOO GUIDE        Total Activity (Ci)      % T. S. LIMIT        HOO GUIDE Noble Gas                                                                          0.1 Cilsec                                                      1000 Ci Iodine                                                                            10 uCilsec                                                        0.01 Ci Particulate                                                                        I uCilsec                                                        I mCi Liquid (excluding tritium and                                                    10 uCilmin                                                        0.1 Ci dissolved noble gases)
Liquid (tritium)                                                                  0.2 Ci/min                                                        5 Ci Total PLANT STACK        CONDENSERPAIR EJECTOR              MAIN STEAM LINE        SG BLOWDOWN                      OTHER RAD MONITOR READINGS ALARM SETPOINTS
% T. S. LIMIT(if applicable)
RCS OR SG TUBE LEAKS: CHECK OR FILL IN APPLICABLE ITEMS: (specific details/explanationsshould be covered in event description)
LOCATION OF THE LEAK (e.g., SG #, valve, pipe. etc.)
LEAK RATE                        UNITS: gpm/gpd        T.S. LIMITS                        SUDDEN OR LONG-TERM DEVELOPMENT LEAK START DATE                  TIME                  COOLANT ACTIVITY      PRIMARY                                      SECONDARY AND UNITS:
LIST OF SAFETY RELATED EQUIPMENT NOT OPERATIONAL EVENT DESCRIPTION (Continued from front)
NRC FORM 361 (12-2000)                                                                                                                          PAGE 2 OF 2}}

Latest revision as of 20:42, 5 February 2020

Part 21 Report Regarding Watts Bar, Unit 2, Potentially Defective Fuses Installed
ML14160A783
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 06/03/2014
From: O'Dell J
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML14160A783 (3)
v • d • e


Text

IMARIM/2#14 P*O 1

(/l/04US. Nuclear Regulatorv Conmmission On erationn. Center Event Reonrt Paa e I Power Reactor Event # 50166 Site: WATTS BAR Notification Date I Time: 06/03/2014 14:15 (EDT)

Unit: 2 Region: 2 State: TN Event Date I Time: 06/03/2014 (EDT)

Reactor Type: [1] W-4-LP,[2] W-4-LP Last Modification: 06/03/2014 Containment Type: ICE COND NRC Notified by: JIM O'DELL Notifications: SCOTT FREEMAN R2DO HQ Ops Officer: CHARLES TEAL OMID TABABAI NRO Emergency Class: NON EMERGENCY PART 21/50.55 GROUP EMAIL 10 CFR Section:

50.55(e) CONSTRUCT DEFICIENCY Unit -Scram Code RX Crit Init Power Initial RX Mode Curr Power Current RX Mode 2 N No 0 Under Construction 0 Under Construction WATTS BAR UNIT 2 POTENTIALLY DEFECTIVE FUSES INSTALLED "WBN [Watts Bar Nuclear] Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN [Sequoyah] Units 1 or 2, or BFN [Browns Ferry Nuclear] Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e)."

The licensee has notified the NRC Resident Inspector.

NRC FORM 361 U.S. NUCLEAR REGULATORY COMMISSION (12-2000) OPERATIONS CENTER REACTOR PLANT EVENT NOTIFICATION WORKSHEET EN #

NRC OPERATION TELEPHONE NUMBER: PRIMARY -- 301-816-5100 or 800-532-3469*, BACKUPS -- [1st] 301-951-0550 or 800-449-3694*,

[2nd] 301-415-0550 and [3rd] 301-415-0553 *Licensees who maintain their own ETS are provided these telephone numbers.

NOTIFICATION TIME FACILITY OR ORGANIZATION UNIT NAME OF CALLER CALL BACK #

Watts Bar Nuclear Plant 2 Jim O'Dell See below.

EVENT TIME & ZONE EVENT DATE POWER/MODE BEFORE POWER/MODE AFTER N/A 4/30/2014 N/A N/A EVENT CLASSIFICATIONS 1-Hr. Non-Emergency 10 CFR 50.72(b)(1) [: (v)(A) Safe S/D Capability AINA E] GENERAL EMERGENCY GEN/AAEC 0[ TS Deviation ADEV E] (v)(B) RHR Capability AINB

[] SITE AREA EMERGENCY SIT/AAEC 4-Hr. Non-Emergency 10 CFR 50.72(b)(2) [] (v)(C) Control of Rad Release AINC El ALERT ALE/AAEC El (i) TS Required S/D ASHU El (v)(D) Accident Mitigation AIND

[l UNUSUAL EVENT UNU/AAEC [] (iv)(A) ECCS Discharge to RCS ACCS [j (xii) Offsite Medical AMED E 50.72 NON-EMERGENCY (see next columns) (iv)(B) RPS Actuation (scram) ARPS El (xiii) Loss Comm/Asmt/Resp ACOM El PHYSICAL SECURITY (73.71) DDDD (xi) Offsite Notification APRE 60-Day Optional 10 CFR 50.73(a)(1)

E MATERIAL/EXPOSURE B??? 8-Hr. Non-Emergency 10 CFR 50.72(b)(3) El Invalid Specified System Actuation AINV E FITNESS FOR DUTY HFIT El [(ii)(A) Degraded Condition ADEG Other Unspecified Requirement (Identify)

El OTHER UNSPECIFIED REQMT. (see last column) El (ii)(B) Unanalyzed Condition AUNA 2[ 10CFR50.55(e) NONR El INFORMATION ONLY NINF E]l (iv)(A) Specified System Actuation AESF ,1 NONR DESCRIPTION Include: Systems affected, actuations and their initiating signals, causes, effect of event on plant, actions taken or planned, etc. (Continue on back)

WBN Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse Letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN Units 1 or 2, or BFN Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e).

Licensing Contacts:

Jim Odell (423) 365-3818 Gordon Arent (423) 365-2004 Tom Metzler (423) 365-7754 Technical

Contact:

Steve Hilmes (423) 365-3286 NOTIFICATIONS YES NO WILL BE ANYTHING UNUSUAL OR YES (Explain above) NO NRC RESIDENT 2 El El NOT UNDERSTOOD?

STATE(s) El E_ []El DID ALL SYSTEMS YES NO (Explain above)

LOCAL [ [] El FUNCTION AS REQUIRED? YE OTHER GOV AGENCIES OEl MODE OF OPERATION UNOE COFPERATIN ESTIMATED RESTART DATE: N/A ADDITIONAL INFO ON BACK MEDIA/PRESS RELEASE El [ El UNTIL CORRECTED2 N/A (MM/DD/YYYY) [] YES NO NRC FORM 361 (12-2000) PAGE I OF 2

NRC FORM 361 REACTOR PLANT (12-2000)

EVENT NOTIFICATION WORKSHEET (CONTINUED)

ADDITIONAL INFORMATION RADIOLOGICAL RELEASES: CHECK OR FILL IN APPLICABLE ITEMS (specific details/exelanationsshould be covered in event description)

II LIQUID RELEASE JEIZGASEOUS RELEASE F- UNPLANNED RELEASE D--I PLANNED RELEASE El ONGOING [--I TERMINATED

[] MONITORED ILIIUNMONITORED [ OFFSITE RELEASE lizi T. S. EXCEEDED 1w RM ALARMS I IAREAS EVACUATED PERSONNEL EXPOSED OR CONTAMINATED LI OFFSITE PROTECTIVE ACTIONS RECOMMENDED *State release path in description Release Rate (Cilsec)  % T. S. LIMIT HOO GUIDE Total Activity (Ci)  % T. S. LIMIT HOO GUIDE Noble Gas 0.1 Cilsec 1000 Ci Iodine 10 uCilsec 0.01 Ci Particulate I uCilsec I mCi Liquid (excluding tritium and 10 uCilmin 0.1 Ci dissolved noble gases)

Liquid (tritium) 0.2 Ci/min 5 Ci Total PLANT STACK CONDENSERPAIR EJECTOR MAIN STEAM LINE SG BLOWDOWN OTHER RAD MONITOR READINGS ALARM SETPOINTS

% T. S. LIMIT(if applicable)

RCS OR SG TUBE LEAKS: CHECK OR FILL IN APPLICABLE ITEMS: (specific details/explanationsshould be covered in event description)

LOCATION OF THE LEAK (e.g., SG #, valve, pipe. etc.)

LEAK RATE UNITS: gpm/gpd T.S. LIMITS SUDDEN OR LONG-TERM DEVELOPMENT LEAK START DATE TIME COOLANT ACTIVITY PRIMARY SECONDARY AND UNITS:

LIST OF SAFETY RELATED EQUIPMENT NOT OPERATIONAL EVENT DESCRIPTION (Continued from front)

NRC FORM 361 (12-2000) PAGE 2 OF 2

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