ML081550645

Slides, Presentation to the NRC on the Causes and Corrective Actions of the Areva Np Mount Athos Road Shipment of Fuel Cleaning Equipment to the Watts Bar Plant Exceeding Transportation Radiation Limits

ML081550645
Person / Time
Site:	Watts Bar, 07001201
Issue date:	05/28/2008
From:	Dunn V, Grandemange D, Land R, Geoffrey Wertz AREVA, AREVA NP
To:	NRC/RGN-II
References
Download: ML081550645 (17)

Text

1

> AREVA - NRC meeting. Atlanta May 28, 2008

2

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Presentation to the NRC On the Causes and Corrective Actions of the AREVA NP Mount Athos Road Shipment of Fuel Cleaning Equipment to the Watts Bar Plant Exceeding Transportation Radiation Limits Ron Land VP Manufacturing Operations Dominique Grandemange Plant Manager Valerio Dunn Fuel Services Project Manager Geoffrey Wertz EHS&L Manager

3

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Presentation Agenda

> Background

> Fuel Cleaning Equipment Overview

> Timeline / Risk Assessment

> Causal Analysis/Corrective Actions

> Conclusions

4

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Background

On February 4, 2008, WB received a shipment of fuel cleaning equipment sent from the AREVA NP Inc, Mount Athos Road (MAR) facility. The receipt radiation survey indicated that Box 455 had a localized hot spot which exceeded the transportation requirements of 10 CFR 71.47.

5

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Fuel Cleaning Equipment Overview Purpose/Use:

Ultrasonic cleaning system used to remove material deposits from the fuel cladding to reduce Axial Offset Anomaly improving thermal performance Secondary benefit to reduce plant source term - dose reduction System Design Considerations:

Underwater components electro polished to support decontamination due to potential contamination Specific container design incorporates shipping restraints and shielding of anticipated high dose components Fuel Cleaner Fuel Assembly Ultrasonic Transducer Housing Fuel Cleaner Filtration Unit Primary Underwater Components:

Filtration Unit Ultrasonic Transducer Housing for Two Fuel Assemblies

6

> AREVA - NRC meeting. Atlanta May 28, 2008 Jan-08 Feb-08 Nov-07 Dec-07 10/24/07 Equipment shipped from Palisades.

Highest contact reading on Box 455 was 80 mr/hr.

10/26/08 MAR receipt surv ey 80 mr/hr.

1/31/08 Pre-shipment surv ey:

FH remained 450 mr/hr Highest contact reading on Box 455 was 40mr/hr.

Activity Timeline Pre-Shipment Inappropriate Action - 4 Lessons learned from past events not applied.

12/13/07 MAR equipment surv ey performed.

Filter Housing (FH) - 450 mr/hr on contact.

Pump - 7 R/hr - replaced.

Pre-operational checkout - 12 hrs of operation (flushing) prior to package for shipment to WB. No change in radiation lev els (fixed).

Inappropriate Action - 2 Containment of high activity material not sufficient for transport.

Inappropriate Action - 3 Equipment shipped on a flatbed trailer.

7

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Jan-08 Mar-08 Apr-08 Feb-08 2/6-9/08 MAR RP Tech to WB to perform survey readings.

2/4/08 WB received shipment w ith Box 455: hot spot reading 2000 mr/hr, 150 mr/hr at 4 inches below box (top of trailer bed), and 5-7 mr/hr beneath trailer.

Discussed shipment w ith WB staff - equipment w as being handled safely Review ed shipment itinerary from trucking company Performed risk review and concluded no immediate risk to driver, public nor w orkers.

WB unloaded the Box 455.

Activity Timeline Post-Shipment 2/9/08 Source material located in Box 455 and removed using duct tape.

Box 455 returned to 1-2 mr/hr.

2/19/08 Source material returned to MAR.

Reading 800 mr/hr behind 3/16" plate, 14 mr/hr at 1', and 2 mr/hr at 36".

Isotopic Analysis -long-lived corrosion products.

Inappropriate Action - 1 Waited to send HP to WB Inappropriate Action - 5 No formal HP training on DRP.

8

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Summary of Survey Results Good Gamma Survey Data Consistency With No External Beta Contamination Found MAR Survey Data WB Survey Data Detector : TELEPOLE Detector : TELETECTOR (gamma readings) 800 mr/hr on contact 2000 mr/hr gamma and beta on contact 25 mr/hr at 12 inches 150 mr/hr at 4 inches No smearable contamination No smearable contamination Detector : TELEPOLE Detector : RSO-5 800 mr/hr on contact 1500 mr/hr on contact (open window) 70 mr/hr at 12 inches 800 mr/hr on contact (closed window)

Detector : TELEPOLE 1 to 2 mr/hr on contact Detector : TELEPOLE 1100 mr/hr on contact Detector : TELEPOLE 800 mr/hr on contact 14 mr/hr at 12 inches On hot spot removed from BOX 455 with 3/16" plate Performed at MAR OUTSIDE of box 455 Performed at WB INSIDE of box 455 Performed at WB INSIDE of BOX 455 after removal of "Hot Spot" Performed at WB On hot spot removed from BOX 455 Performed at MAR

9

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Safety Significance Survey data illustrated graphically Conclusion of Risk Assessment :

No Undue Risk to the Public or Truck Driver

10

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Causal Analysis & Corrective Actions

> Two Apparent Causes AC #1 - The procedure for pre-shipment surveys did not have an activity threshold for additional consideration of containment of high activity material prior to transport.

AC #2 - The procedure for pre-shipment surveys did not have any specific requirements for consideration of additional packaging or use of a closed conveyance trailer.

11

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Causal Analysis & Corrective Actions

> Corrective Action #1 Established pre-shipment radiation survey activity thresholds.

• Thresholds trigger additional management review

• Applicable to all MAR equipment shipments.

> Corrective Action #2 Clarified roles and responsibilities for RP and operations personnel to ensure proper packaging of all radioactive equipment.

• Enhanced ownership of equipment packaging.

12

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Causal Analysis & Corrective Actions

> Corrective Action #3 Added requirement to perform extensive surveys of highly contaminated equipment, for example:

• Reactor Cavity

• Below the Reactor Head

• Spent Fuel Pool

> Corrective Action #4 Fuel Cleaning Equipment is transported in a closed conveyance.

> Above requirements added to SL-1600, Shipment and Receipt of Radioactive Material.

> CAs 1 - 4 are completed

13

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Contributing Causes & Corrective Actions

> CC #1 - Extent of Condition Review had not been performed using previous MAR receipt shipments which exceeded transportation limits.

Corrective Action

1. 1 - Performed an external assessment of RP practices in shipment preparation - complete.

• Results matched internal ACA findings.

1. 2 - Open CA to perform a Lessons Learned Review.

• Implemented through CAP and audit process.

14

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Contributing Causes & Corrective Actions

> CC #2 - RP technicians did not have formal training on Discrete Radioactive Particles (DRP).

> Corrective Actions

1. 1 - Procedure SL-1291,Discrete Radioactive Particle Control created

1. 2 - RP technicians were trained on the procedure.

1. 3 - Formal DRP Training Program developed.

1. 4 - Initial & Recurring Training added to the RP annual curriculum.

15

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Contributing Causes & Corrective Actions

> CC #3 - There was a 2 day delay in dispatching a MAR RP technician to support the event investigation.

> Corrective Action Requirement to dispatch an RP technician immediately if a transportation container exceeds any transportation limit.

Requirement added to procedure SL - 1600.

16

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Corrective Action Summary

> Corrective Actions 1 - 4 are complete.

> Subsequent Lessons Learned Review will validate apparent and contributing causes and ensure effectiveness of CA implementation.

17

> AREVA - NRC meeting. Atlanta May 28, 2008 AREVA NP Inc.

Conclusions

> MAR recognizes the potential risk this event as important. In this case, the risk to the public or workers was very low.

> MAR causal analysis investigation was comprehensive.

> Corrective actions were comprehensive and complete.